(A/N) Hey! My name is Iron, and this is my first fanfiction! REVIEW! DISCLAIMER: I do not own Adventure Time or any of its characters. Those belong to Pendleton Ward. I do, however, own the story and the antagonist OC, but you'll see who he is later ;) Also has some Final Fantasy themes.

Chapter 1

Another day of fighting monsters and saving people made a 14-year-old boy and his sidekick dog tired. Finn was the only remaining human left on the world of Ooo, and he was still coming to terms with that. The thought made him feel lonely. He had many friends, but he still felt alone.

"What's wrong, Finn?" His dog friend, Jake asked.

"Oh, it's nothing. Just thinking." Finn replied.

"You know I'm here for ya, buddy. You can tell me anything!"

"Well," Finn paused, trying to find the right words to say. "I really feel lonely."

"But, I'm right here!"

"Not like that, Jake."

"Oh, you're still bummed about that? Finn, it's hard, I know, but you just have to look past it."

"But, I just can't!" Finn cried. "This really shouldn't be happening! I can't take it anymore!"

Sobbing, Finn ran off. Jake felt bad. Finn had just learned the truth a few days ago. He and Finn had been through a lot together. The Ice King, The Lich, the Wizard Battle. Gosh, it's been so long.

Finn decided the company of Princess Bubblegum would make him feel better. He loved Princess Bubblegum; he wished she were with him, yet he somehow felt like she didn't think of him that way. He shrugged the thought off. And he saw something strange, a man, about the same height as him, wearing what appeared to be a cloak of some kind.

The man looked at him. Finn froze. He felt strange, like he should somehow know this man. The man smiled at him, and disappeared. That shocked him, as he never noticed that kind of magic before. He had seen ice magic, fire magic, and other types of magic, but never teleportation.

He arrived at the castle; the warm toastiness of the graham cracker and gumdrop halls greeted him. Princess Bubblegum was cleaning the main hall, a smile on her face. She noticed Finn and felt adrenaline rush to her cheeks and heart.

She ran to him, and crashed into him. The soft, pink female hugged Finn. Her bubblegum hair always smelled nice, and he loved it. He loved her.

"Finn, it's so good to see you! Is something wrong?" PB asked.

"The Mushroom War." He muttered.

"Oh, I see. I don't know what to say."

"How did it happen?"

"Well, there were two groups fighting each other, and it seem like everything would go out of control, so they launched the Mushroom Bomb, and ended the fighting."

"But it wiped out all the humans."

"Yes, I'm afraid so."

Finn sunk to the ground, tears forming around his eyes. Princess Bubblegum sat down next to him, putting her arm around him. He couldn't help it, that lonely feeling imbued him. What was his family like? His original friends like? The questions made him sadder.

Suddenly, he thought about that hooded man. Finn only got a glimpse of his face, but he could make out his face. The man looked almost like Finn, except a bit older. He had an average build, with noticeable muscles forming on his arms. But what haunted Finn the most was that smile.

That cruel, twisted smile.