Pre-A/N:

Hey guys, This is my version of the Swap Au. I did this because I'm not contented on the current swap au fanfics. The reason is that it's always incomplete, the only ones which is swapped are the Diazs and the Butterflies, and also thier personalities didn't match. So I made a total Swap Au with almost every character are swapped! Hope you enjoy it!

Daron owns Star vs the forces of evil

Chapter 1: Safe Prince comes to Earth

Far far away in a land called Terra, Where corn grows and monsters dwell, Lived a magical prince, Prince Marco Ubalbo Diaz.

"Is it safe to walk downstairs?" The prince asked as he walked down the stairs, inspecting if something can knock him out of the stairs. He is a fine young lad with brunette hair and chocolate brown eyes. He has a little mole on the left side of his cheek, the Diaz royalty symbol. He wears a red royal vest with shoulder pads and red pants

"I am Prince Marco Ubalbo Diaz" He narrated as he walks out of the castle "Some people may say that I am clumsy and too safe to try new things. Maybe because I have no friends" He said as he walked down the streets and Children teases him

"Safe Prince! Safe Prince!" They chanted "You will never have friends, Safe Prince" They teased. Marco ignored them as he walked to the stables

"And I don't know how to ride a dragon" He narrated as he mounted himself on a dragon's back, only for him to fall off but the saddle belt keep him hanging on the dragon's side. The huge reptile was startled by this and went on a rampage driving some citizens away.

"I have a lot of responsibilities" He said as he muttered apologies to the people of Terra " And I'm about to have a whole lot more because today is my 14th birthday And according to tradition, my dad the king has to bestow upon me our greatest family heirloom: the royal magic scepter" He said as the dragon entered the ceremonial halls, where the king and queen are waiting. Seeing the royal couple, the dragon stopped on his rampage and due to the sudden break, The strap on the prince's saddle snapped and he was sent flying in the air then landing roughly at the front of his parents

"We should make the seat belt more stronger and safer" He mumbled as he rises on his feet and began dusting his vest

"Now, Marco, this scepter is a big responsibility. If it falls into the hands of evil forces, the universe could be destroyed." King Diaz said deeply as he extended the scepter and waits for Marco to get it

"I don't think I can handle that kind of responsibility" The prince nervously said

"Oh come on, Darling. It'll be fine" Queen Diaz said, encouraging her son to grab the scepter

As soon as Marco touched the scepter, bright purple and blue lights enveloped it and transformed the scepter from King Diaz's mexican skull design to Marco's design. It is now bright red helmet appeared on the head of the scepter, two metal wings appeared on the side, a sun fragment in the center and its long rod is shortened. Marco inspected the scepter carefully but scared to cause havoc so he was afraid to try it out

"Come on my son, try your new scepter. Cast your first spell" Queen Diaz said

"I don't think I can" Marco replied

"Don't be afraid Mijo, It's your first spell. How bad can it be?" Queen Diaz said as she put her hands to her son's shoulders. Marco smiled as he raised the scepter up high

A few minutes later, a huge black cloud hovered above the kingdom of Terra, blasting lightning bolts and raining confetti. The citizens of Terra was running in complete panic as the cloud continued to wreak havoc. The king and queen watched the young prince sneak away from the havoc he created

"He can't handle it" They both said

The king and queen decided to send the young prince away to another dimension to practice his magic. They gathered all of his belongings and put them in a carriage as the young prince wailed in protest

"Nooo! I can be more proper! Please don't send me to Saint Skeeves' Reform School for Wayward Princes!" He screamed while pulling his father's cape, as he imagined himself being dragged into the terrible school. "I heard the teachers in there are trolls!" He added

The queen giggled at her son's reaction and quickly comforted him "Relax Mijo, we aren't sending you there" She said

Hearing that Marco immediately let go of his father's cape and stands up

"Oh" He said in relief

"Yet" King Diaz quickly added. That made the prince frown

"We're sending you to a safer dimension to practice your magic; A place called Earth" The queen said

"Earth?" The prince muttered, completely confused at the new word

King Diaz then pushes him toward the carriage despite complains. The queen then immediately commanded their manservant

"Ruberiot, Open the portal" The queen ordered

Ruberiot, the manservant, uses a pair of scissors to tear a hole out of thin air, the hole began to grow into a portal, enough for the Griffin-drawn carriage to enter. The carriage starts moving towards it as the prince looks out the window to glance at his kingdom one last time "Goodbye Terra" He said as the whole carriage disappeared through the portal. Little did he know that a silhouette was watching him from the bushes, laughing maniacally

The carriage end up to Echo Creek High School a few minutes later, The King and Queen was talking with Principal Gemini in his office. The principal was a fat man with an eye patch on the left eye.

"So you say you're from another dimension" Principal Gemini said disbelief then light of the office turned off. They turned to see Marco flicked upon a light switch in fear

"You said there was no magic on Earth! How do this do magic and is it safe?!" The prince said in fear.

Hearing that the principal knew he can't handle the overly sensitive prince

"Yeah... This isn't gonna work" Principal Gemini muttered.

The king opened a chest full of gold and jewelries to bribe the principal. Seeing the chest, the principal's only eye turned to a dollar and he was filled with greed which made him change his mind. "He's gonna love it here!" The principal shouted with acceptance

The king and queen glanced at Marco, who was still inspecting the light switch carefully

"He's going to need a guide" King Diaz said

"And a cheerful one" Queen Diaz added

Meanwhile on a classroom, Star Butterfly was drawing pictures of whatever entered her imagination. She was a beautiful young lady with a long blonde hair and oceanic blue eyes, she have weird hearts on her cheeks, which are her birthmarks. She wears a green dress with a purple octopus, stockings on her legs and rhino like boots.

She was interrupted from drawing from the P.A. System of the school

"Star Butterfly to the principal's office. Star Butterfly to the principal's office" The principal announced by the P.A. System

"What do you want from me this time, Principal Gemini" She muttered as she stands up from her seat and walks out of the door

"Star Butterfly, You know it's rude to leave a classroom without asking for a hall pass" Miss Heinous, her Math teacher, said. However, Star didn't listen as she walked passed her teacher and exited the room

She meets Principal Gemini standing in a halls and a young boy in a red hoodie at the fountain. The boy pressed the fountain's button and when it spouts water, he backs away in fear and raises his fists. Star looked at him in confusion.

"Star! I want you to meet our new foreign exchange student. Marco Diaz" The principal said "I need a cheerful student that is quite responsible to show him to the world. He's very shy so I think that if anyone can help him its you, The Cheer Girl"

"What?! No-no-no-no! I am completely wrong for this. It doesn't mean that my parents have high responsibility means I am responsible too. I am completely irresponsible" Star said in protest. The principal just chuckled and pinched her cheek

"You are so cute when you're in denial. Now I'm off to the ice cream shop. Daddy's getting all 52 flavors!" He said as he left

Star glanced over to Marco who was punching and kicking the water fountain

A few moments later, Star have been giving a tour to the safe prince

"Thanks for showing me around, you really are responsible" Marco said

"What?! No!" The girl scowled in protest "Look, whatever you heard about me isn't true. I don't know where people get the idea I'm so responsible! Oh, watch your step. Loose tile." She said as she pointed at the tile to prevent the prince from stepping on it

"It's ridiculous!" She then closes an open locker "Careful. Just because your parents have high responsibility everyone expects you to become responsible! Oop. Broken glass." She said as she adjusted the prince away from the sharp objects on the ground "Frankly, I like having fun and would welcome a little excitement in my life." She finished with a bold tone

The prince smiled as he took out his scepter and blasted a nearby ant. The ant growed ant transformed cheerleader with pompoms on each of it's six hands

"Give me an A-N-T! Hooray!" It shouted as it went to the students

"What was that?!" Star asked in amazement

"I thought you wanted to have a little fun so I made that" Marco said

"Wait, who are you?" The girl asked him suspiciously

"I am Marco Diaz, magical prince from another dimension" He said as he created a huge sun above his head and a few critters appeared behind him. After a few seconds the sun turned into a rain cloud and the creatures quickly scurried away, leaving the prince with a frown "Geez, I should stop doing that" he said as rainfall began pour down on him

"Wait, you're a magical prince?!" Star shouted "Do you always have fun?" She asked

"Actually no, I have a lot of responsibilities and I was thinking that you could help me" The prince replied

Hearing that, Star's eyes widened and she backed away "Well, that brings us to the end of our tour. I'm going home now." She said as she left the boy

"Okay...goodbye...new friend...see you...later" he shouted in a sad tone "Way to go, Diaz. You just lost another friend" He muttered to himself

Later, Star walked home but when she opened the door, she was greeted by the most unexpected sight: The prince Marco Diaz was in her house with her parents!

"Oh, Star! Come meet the new foreign exchange student who's gonna be living with us!" Mr. Butterfly said to his daughter

"W-Wha...? Wha...?" Star mumbled in confusion

"Oh, they're your parents, I should've known that. I just assumed Butterfly is a common last name" Marco stated

"We believe that Marco's responsible attitude and calm personality will bring a little bit of peace in our house" Mrs Diaz said

"If you want calm, you should've just adopt kittens" The girl muttered

"I like kittens" he said as he raised his wand and summon a litter of 8 kittens

"Awww" Star's parents said in adore at the kittens

The kittens start spitting plasma furballs from their mouths, to everyone's surprise. Their fur-balls knock over a lamp and burned a hole through Star's face in a Butterfly family photo. Star glared at Marco angrily.

"Oops, I can fix that" He said as he raised his scepter and everything went back to normal and the kittens calmed down

"See Star, Marco is responsible. I'm sure he can teach you to become more responsible too" Mrs. Butterfly said

"Now, why don't you show Marco his new room" Mr. Butterfly requested

"Ugh, fine" Star muttered as she dragged the prince's luggage upstairs with Marco and the kittens following her from behind

Unbeknownst to them that a huge green frog was watching them carefully. The frog then opened a portal using a pair of black scissors and leapt through it. He landed inside a strange looking castle, in front of a throne, he croaks then salutes before speaking

"Jeremy, master, I've tracked down Marco Diaz. They've hidden him in the Earth dimension. Unguarded." The frog reported

Behind the throne, a pair of evil red eyes are seen, and evil laughter was heard from there. The throne turned around revealing a massive stack of pillows and Jeremy; a small yellow bird-like creature who wears a dark green cloak and a skull crown similar to those of a bull.

"Excellent work, Brantley. I knew they couldn't hide that royal brat from me for long. Then I'll have what money can't buy." He said as his voice become higher "Soon, the scepter will be mine. And then the universe. And then...!" He quickly halted himself as he couldn't find something greater than the universe "Actually, the universe should do it." He said before his voice turned deadly serious "I'm coming for you Prince Marco!"

Meanwhile on the Butterfly Household, Star shows Marco his new bedroom, a dull, dark and empty room.

"Okay, here's your new room!" The girl presented as she dropped the luggage recklessly on her foot causing her to wince in pain.

The prince looked around the room in discontent before raising his scepter "Okay... I can work with this. Sparkle Glitter Bomb Expand!" He shouted as a magical bright lights filled the room and transformed the room into a gigantic castle loft

"Whoa..." Star muttered in amazement as Marco sat on his king-sized bed "Why did you transform your room? I thought princes can live on small space" She stated

"Well, I'm different. I need a huge personal space and its better than what it's supposed to be" The prince answered, Star just shrugged

"I wish my room was as big as this" She stated as she gestured around the room

"You know I could always grant your wish, Star" He said as he raised his scepter

Star squealed in excitement as they went to her room. As soon as they get there the prince immediately casted a spell.

"Mystic Room Wreck Transform" He shouted as a huge solid block dropped and crushed everything Star owned. The girl gasped in horror as the block started to move towards them. They quickly shut the door to prevent it from moving

"'Wreck'?! 'Wreck'?! Why was the word 'wreck' in that spell?!" Star angrily asked the prince

"I don't know! It just came out that way!" Marco replied

The girl let out a groan and repeatedly slams her head on the door

"They told me I'm responsible. But I'm not! I can't even hold this stupid safe prince! I tried to be responsible and the result is my room getting crushed. Could this day get any worse?!" She mumbled to herself

Marco watched her in regret and guilt then he tried to calm her down and earn her forgiveness, which didn't end well.

"I'm sorry, Star. Uh... how about a little rainbow to color your day?" The prince asked as he conjured a rainbow above the girl's head, which immediately caught in fire

That caused the girl to finally break, she can't take it anymore, she had enough and too much of him. She madly faced the prince

"I can't take this anymore! If you're moving in, I am moving out!" She shouted as she leapt at an open window and fell down. Marco looks at her with a worried expression as he saw her lying on a bed of thorny roses

"Are you okay? Are you hurt?" The prince asked

"Luckily, the roses broke my fall" The girl answered

"Do you need any help?" Marco asked

"I'm fine, just leave me alone!" Star shouted as she storms off

The prince watched her walk away, regret and guilt was visible in his face "Way to go, Prince Diaz. You really ruined her day" He sarcastically said to himself

Later at nightfall, Star was standing outside Slurp n' Stop, she was not allowed to enter since her flaming rainbow might burn down the store. She asked for refills and acted crazily, frightening the people around her. Marco suddenly appeared from behind her

"What are you doing here?!" The girl asked

The prince then makes the rainbow disappear by a beam from his scepter

"Star, I'm sorry I ruined your day. I was just trying to be friends with you but I always ruin everything. So I wish you can forgive me. I didn't get a choice about coming here to Earth, and you didn't get a choice about having to deal with me" He said, Star's heart began to soften by his words and she began to feel guilty "I'll... I'll find another family to live with. It's been a pleasure meeting you, Star Butterfly" He said. Star was filled with regret, though her expression turns from regretful to fearful as she sees something behind him "Uh... M-M-Marco?" She stuttered as she pointed behind the prince. Marco turned around to see a large group of monsters led by a small bird monster

"Marco Diaz, at last I found you" The bird said

"Jeremy Birdbaun, how did you find me?" The prince asked, quite demandingly

Jeremy just chuckled "Wouldn't you like to know?" he asked

"Yes, that's why I asked" Marco replied

"Well, Brantley here-" The bird monster cuts himself as he realized something "Hey, I don't have to tell you anything. Attack!" He shouted as his minnions roared and charged at the prince

Marco poses his battle stance when Star rushed in due to her instinct and elbowed the three-eyed carrot monster in the gut and kicked its head. The prince watched the girl fight the monsters

"You can fight?!" Marco shouted in disbelief

"Its called... kickboxing" Star said as she posed another battle stance

Marco blasts the Tigericorn, while Star kicks Goatbeard who is wielding a hammer; she kicks him in the stomach, and the hammer bonks him on the head.

"You said he was unguarded" Jeremy said as he shook Brantley. The frogs just shrugs

Marco hits the two headed minion continuously with his scepter and Star jumps behind a giraffe-headed minion and kicks its head causing it to be trapped in a car

Marco knocks over a monster with his scepter, and it whinnies in pain. Star appears next to him, and they smile at each other as Star elbows the two-headed minion. Marco blasts Brantley back into a lamp-post.

"Get up you useless dirtbag! You're embarrassing me" Jeremy shouted to the frog

Hearing that Brantley immediately stood up and breaks the lamp-post off its base, using it as a club. He roars as he tries to swing it violently, Marco sees him coming and immediately casts a counter spell

"Jellybean Hallucination Mist" He shouted as a blue blast hit the frog. Brantley became dizzy and he hallucinates raining jellybeans and his face on his hands.

"Whoa... What is happening?" he mumbled in his weird state

Marco and Star watched him while laughing and they're were caught off guard when Three-eyed Carrot Man and Big Turkey punched them to the ground. Star rose up and kicked them away while Marco was charging his scepter

"Mega Orca Blast" He shouted as an army of huge sea creatures shot out of his wand and knock away all of the monsters (excluding Jeremy)

The avian monster looked at his minions and was quite displeased in them

"You want some this, Jeremy?" The prince taunted as he hang the scepter in his hands

"No..." he said, admitting defeat as takes out a pair of dimensional scissors and scolds his minions "You see, you morons?! This is what happens when you don't work out!" He shouted as he leapt on air and opens a dimensional portal "Your muscles are like pudding! I don't pay you just to get beaten! Come on, back in the portal, back in the portal. You even retreat like losers"

One by one the minions entered, all full of bumps and bruises except Brantley who was still hallucinating

"I'm freaking out...!" The frog muttered as he entered

Jeremy entered the portal last but still created a threat "I'll get you next time, Marco Di-" He was cut when the portal choked him as it closes. He quickly pulls himself leaves his skull crown

As soon as the monsters left, Star screamed happily

"That was amazing! I was amazing! You were amazing! Danger is fun!" She shouted

"Yeah. I guess it is." Marco said before becoming sad "Well... I should probably go pack my bags. I don't want to ruin your life and bring you more responsibility. I know when I'm not wanted" he said as he walks away sadly. The girl follows to stop him

"Wait! I don't want you to go. I want you to stay with us." Star said to the prince

"But why? I bring nothing but problems" Marco replied

"Well, its true that you bring problems but that's what's so fun about you. You bring more danger and excitement in my life like nothing before. If being around you means more fun then I'll totally accept you" Star said

"Really?!" The prince shouted in delight "Um... This maybe weird but may I hug you?" He asked

Star didn't answer as she threw herself into the boy, enveloping him in a warm embrace. The prince melted by the sudden warmth and comfort the girl brought to him. They pulled away and started walking home

"So what kind of fun do you want tonight, Star" Marco asked

"Nah, maybe we could just get some sleep tonight." Star answered as she let out a yawn "I'm pretty exhausted from what happened today"

The prince smiled at her. "Whatever you say, 'Fun Princess'"

Post-A/N:

So guys did you like it? Just in case you don't know who are swapped, here's a list:

* Star and Marco

* Butterfly and Diaz family

* Ruberiot and Manfred

* Skeeves and Gemini (Miss Heinous' assistant)

* Miss Skullnick and Miss Heinous

* Ludo and Jeremy

* Buff Frog and Sensei Brantley

Please leave me reviews and tell me what you think. That's all, The 13th Narrator out.