Welcome!

Fair warning, this is not going to be just a two series crossover between just Skullgirls and RWBY. I don't know what to set the category for if it's three ways.

So this is based on a huge multiverse I got going that began with the characters of Team Fortress 2 crossing over into the world of RWBY through a teleporter accident. The source story is called 'Mercs in Remnant' and is on-going while also going through a rewrite simultaneously (?). The short version is this, the TF2 mercenaries become professors at Beacon where they go through a bunch of crazy adventures with the RWBY crew complete with elements of both worlds mixed in. Also, there is a lot of fourth wall breaking. The fourth wall is broken so often, that it is quite literally a core element. Like the multiverse concept and the few beings who are aware of it.

For story sake, this takes place in a separate timeline from 'Mercs in Remnant' where the mercs are still teachers and the Fall of Beacon hasn't happened at all.

Now the craziness spills into Skullgirls...

Prologue: Two Bored Goddesses

The goddess of time, Aeon, watched the scene playing out on her television with interest. Usually she'd be monitoring the progress of the latest Skullgirl, but this time someone else has caught her attention. The television showed a large battle happening between nine men and a team of teenage girls fighting against dark monsters of evil. However, the battle was not taking place in this world or is anything fictional, for it is taking place in a completely separate universe.

Being a goddess with mastery over time, she watched the not-of-this-universe event play out as if it were a television show, and in a way it really was. Super powerful beings like her had the privilege of knowing other worlds exist and observing them, but there was little else they could do but watch. Didn't change how entertaining it was though, brought about a nice change of pace from watching the Skullgirls over the centuries fail again and again. That, and she already knew how all the timelines except for the convergence one will play out since she was the goddess of time in this world, but she had no such power in other worlds. Only the ability to watch, as said before, and she enjoyed not having things spoiled right away due to her power.

The nine men were all mercenaries from a game called 'Team Fortress 2', and the girls were from a web show called 'RWBY'. They were together because this was one of those 'crossover worlds' that appear every now and then when the creators of both worlds decide to collab, and the goddess found that she liked it quite well.

Aeon absolutely loved to play TF2 and she loved watching RWBY being the literal goddess level otaku she is. So when she found that Gaben and Monty had joined their two worlds together to see how it would go, she was immediately hooked. How she wished she could do things like this with her other favorite series! The best she could do is making fanfiction, for despite being a goddess with enough power in her to see other universes, she was still technically a creation of beings greater than herself. As in her creators, Alex Ahad and Mike Zaimont. She did ask multiple times if it's possible for her to have more freedom in the multiverse, but they always kept The Trinity restricted to Skullgirls since they wanted to avoid a whole slew of legal issues and licensing to get a full on crossover.

The only reason why Monty and Gabe could do it was because they were practically considered gods in the real world anyway.

"Did the Skullgirl win yet?" An annoyed voice said, even though she already knew as well.

Aeon's head snapped up, and she turned to see her sister, Venus Lovelace the goddess of space, come into their shared room.

"Oh, you're just watching one of those dumb shows again." Her significantly more scantily clad sister said.

"It is not dumb, sister, it's a thrilling crossover series by Valve and Roosterteeth." Aeon stated in her usual calm way. Unlike her sister, Aeon was dressed properly except for her entire torso. Mostly because she had a literal hourglass figure that composed her torso. Fitting since she was the goddess of time.

"I'm just messing with you, sister." Venus nudged her side with a playful smile. Mischievously, she moved closer to her sister to mess with her further until Aeon scooted away.

"Not now, I want to finish this episode before monitoring the Skullgirl... again." She sighed. Venus pouted, and sat next to her to see what her geeky sister was so interested in.

"What's so good about this crossover anyway?" Venus asked. Unlike Aeon, Venus was more rebellious and loved action, always wanting to hurry up the destruction of the world against her Mother's wishes.

"One of my favorite class-based shooting games is crossed with my favorite web show!" Aeon exclaimed as loud as her soft voice can make it. "Now please, either you sit down and be quiet, or leave."

Venus saw that Aeon was determined to keep watching, and she knew how seriously her sister took this geek thing of her. Just like Aeon, the goddess of space resented how she had no power over other universes. Though in Venus' case, she was far more displeased about it because you'd think someone who can control all matter would be able to interact with other universes at a whim, but that's sadly not how the multiverse works. Don't get it wrong, she respected Alex and Mike for creating her and the universe her family rules over, but she just wished they had more interesting things happening. Like her sister, she was getting bored of waiting for all the timelines to converge into each other and really wanted to do something other than watch and wait. Honestly, Mike and Alex weren't technically stopping her from doing anything to the world. All they did was create it, and it was actually Mother who was holding her back. Well, Alex and Mike and their development team were responsible for creating the timelines for the characters, but they left the ultimate fate of the world to Mother who was waiting patiently for the right time, whatever that means.

While Venus grumbled to herself, Aeon had a thought come to her mind as she was finishing up the episode. What if one of the RWBY girls come into her universe? The thought has been in her mind before, but now it's resurfacing again. The more she thought of it, the more she wanted to do it.

"Sister, do you think we can bring a girl into our universe?" Aeon asked Venus.

"Hmm? You don't mean one of the girls on the screen, do you?" Venus asked, to which Aeon nodded her head. "My, this is something I'd never would've expected from you. Guess a bit of my rebel side is rubbing off on you." Venus smiled.

"Not exactly..." Aeon began. "I just want to see what would happen if we bring a girl from there into this universe." She said, pointing at the TV right when it showed a closeup of Ruby Rose, leader of Team RWBY.

"Aww... my dear sister really is becoming more like me!" Venus cooed, smiling at her sister's shy look. "Wanting to crossover universes by herself like she's from the real world..." She teased further, but then she got more serious about it. Now this was a potential change of pace that Venus was more than happy to take. "Now smuggling someone in from another world is hard, but not impossible..."

"Wait, are you really suggesting we go through with this?" Aeon asked in a more alert tone. "I didn't seriously mean to-"

"No no, you suggested it and you want to do it." Venus interrupted her sister with a smug look on her face. "It's either you act or not at all, sister, and I want to act. I'm tired of doing nothing around here..."

"Well, what do you suggest we do then?" Aeon asked, sounding very unsure about this as if she was afraid to get in trouble with their creators. Venus' response was to just open a portal that literally had sharp teeth lining it that led to the Void.

The Void Between Universes

The two goddess-sisters stealthily approached the portal that was the entrance to Remnant, where RWBY takes place and also where the crossover Aeon was watching earlier takes place in for most of its duration. The two were hiding behind a chunk of totally random Void debris, being very careful to not be seen otherwise they be sent right back to their universe.

"Okay, it looks like Gaben and Monty aren't around..." Venus said as she scanned the surrounding space. The goddess had a wolf is smile on her face for she was excited for this naughty mission she was on. "I haven't felt this alive since forever!" She exclaimed to herself. "So, we're just gonna drop in and take everyone, right?"

"No! That would be way worse than just taking one person! We shouldn't be doing this at all..." Aeon trailed, glancing around in case there was someone around. "Besides I said a single girl."

"Ugh, and here I thought you wanted to do something exciting for once..." Venus sighed. She really wanted to bring in the whole crew to see how much trouble she could stir up, but she guessed one girl was excitement enough. For now... "Look, I'm gonna drop into that portal and take a single girl out, then we'll leave. Happy?"

"I don't know... but as long as we're not caught, I suppose. But how are we going to sneak her in without anyone noticing?" Aeon kept on worrying, much to Venus' annoyance. However, before Venus could answer, a voice called out.

"I noticed."

Immediately, both sisters turned around, and their jaws dropped. They had been caught by none other than Monty Oum himself. Venus cursed to herself as her sister wasted time worrying, and Aeon kept on worrying about what Alex was going to do to her, maybe taking away her access to watching the multiverse...

"What are you two doing here?" Monty asked. He knew who they were. The legendary animator was a fan of Skullgirls himself.

"Mister Oum!" Aeon exclaimed, all the sand in her hourglass body dropping to the bottom as an equivalent to her heart dropping. The goddess then began stuttering out stuff in a strange mix of fear and fangirling over his work, but Venus quickly shut her up with a hand over her mouth.

"We're here to take one of your girl characters." Venus stated defiantly in the face of a being above her in so many levels. To her, this was just her rebelliousness taking over and it felt great to stand up.

"You mean put them in the Skullgirls world?" Monty asked. Venus nodded while Aeon still shook, a slight rattling sound heard from the vibrating glass of her body. "Hmm... sure. I don't see why not." The man shrugged.

Now this caught the two goddesses off guard so badly, that they froze in place. Even Venus who was so eager to keep on resisting had lost her composure there.

"I'm sure something awesome is going to happen if we drop one of my characters in there..." The man thought, thinking of another interesting crossover even though he already had one ongoing. "Sure, take Ruby. I'll talk to Alex and we can work something out."

The sisters cannot believe what they were hearing right now. Monty Oum was going ahead and making this a crossover for them! Aeon was so excited that she couldn't even express other than looking dumbfounded, and Venus was slightly disappointed that this was way easier than she thought it was going to be. Still, she had the satisfaction of looking forward to what possible mayhem could happen if that girl was dropped in, she guessed.

Looking to each other, both sisters nodded their heads, and grinned.

Venus knew what to do right away, and she had a grin plastered firmly onto her face as she summoned her own toothy portal instead of using the one already there.

Remnant

It was a tiring day for Team RWBY. Just earlier, they fought off a huge wave of tough Grimm with the gladly accepted assistance of their professors, otherwise known as Team Fortress or RED Team. The girls had done really well, especially with the mercenaries being there to provide healing and much needed support in battle.

Currently, everyone was crammed into Sniper's Camper Van and had just arrived at the mercs' staff house. The mercenaries, being the gentleman they are, let the girls ride in the back while a lot of them sat on the roof which they were completely fine with. The huntresses were so exhausted from the fight, that they had fallen asleep in the van while the mercs are still as active as possible due to their years of experience fighting battle longer and bigger than these. Even the Camper Van was running fine, and it was severely damaged and scratched up at places.

When they arrived at the mercs' house, the first thing the sleepy huntresses did when the door was opened was run into the living room and plop down on the comfy sofas, falling fast asleep.

"Heh, look at 'em..." Sniper chuckled. The mercenaries found it rather endearing as all four of them had crammed together on a single sofa. They genuinely liked the girls and considered them friends, and the mercs took good care of their friends.

"Heavy will bring down blanket for them..." The Russian giant smiled.

"I'll tell Ozpin they'll be staying with us tonight..." Spy sighed with a soft smile.

So they got all the necessary work and things they wanted to do sorted out before retiring tonight. Before they did though, there was one last thing they had to do, and that was to unload the stolen dust they stole from some White Fang who stole it from some gang who stole it first! It's a big inception of stealing, but the mercs planned on selling it to a gang, then stealing all that gang's shit before getting the authorities to capture them with the contraband. That way they'll look good to the public while being rich! Like, they're still good guys either way, just good guys with shady business practices. Their reputation with people outside of Beacon wasn't really that high anyway, but then that's all the more reason to make themselves look better, right?

While they were carrying the illegal goods past the sleeping Team RWBY, a massive tremor soon shook the entire house. Immediately, the mercs dropped everything and struggled to stand on their feet.

"WE'RE UNDER ATTACK!" Soldier yelled in the most cheerfully wrong way possible right now.

Team RWBY was immediately awoken by the shaking, and they fell to the floor.

"What's happening!?" Ruby yelled over the loud noise of the tremors and thing crashing.

"IT'S AN EARTHQUAKE!" Scout yelled. He appeared to be right as the shaking indeed felt like one. What, with everyone and everything flying off the shelves and hitting the ground...

Then, it wasn't an Earthquake at all as the roof and second floor of the house was ripped open to reveal a huge Lovecraftian looking portal above them complete with teeth lining up the interior. Everyone looked on in shock at what appeared to be a just as large nightmare fuel looking creature with multiple eyes and multiple other indescribable body parts just all over the place. An even bigger shock came when the creature's body shifted into the vague shape of a woman, and it began giggling.

At once, Team Fortress and Team RWBY scrambled for their weapons, but they soon froze in place when an even bigger shock overtook them. The creature then shifted into the full form of a scantily clad woman with glasses, dark hair, and large teeth lining up the sides of her torso. It, or rather she, licked her lips and giggled some more at the silly mortals below.

"Hehehe... just messing with you~" The giant girl above teased. None of the people below her could form any words, just silent shock. Without warning, the slender hand of the giant woman reached down and two long fingers plucked Ruby right out of there!

"I'll be borrowing her..." She uttered out as Ruby scrambled to be put back down.

Immediately, everyone snapped out of their shock and picked up their weapons, but it was too late. The woman had turned back into the grotesque nightmare thing after taking Ruby back into the portal, and it disappeared without a single trace.

Venus pulled her hand out of her portal and out came an unconscious Ruby Rose. Being a goddess of space with the permission of Monty, she totally mindfreaked this girl's friends into thinking a giant monster came and took her when in reality. Ruby wasn't in the hands of a giant evil goddess, that was just an illusion. She was just in the hands of a regular evil goddess.

"Alright Aeon, I got her." Venus grinned to her sister who was visibly getting excited. "Thanks Monty. I think we'll be going home now. Bye!"

Should I keep the story tags as RWBY X Skullgirls or should I change it to Team Fortress 2 X Skullgirls? Or is there another option that I am not aware of? Like, seriously, what do I categorize a three-way crossover?