A batfam/pjo crossover because I'm honestly so obsessed with both and why not write one. This is probably only gonna be a bunch of random storylines grouped together as one because there's no way I could finish a whole story because could never figure out a good enough plot. I had a lot of headcanons about this AU and I'm just really proud of it okay?

the list of headcanons for this au is on my Tumblr here:

post/163141582348/batfampercy-jackson-crossoverau

Definitely go check that out! I promise it's worth it. Also scroll through the tag "batfam pjo au" while on my Tumblr because there's more posts than just that one (some may include spoilers though...)

EDIT: every time I type in that link, it changes it so it won't work. I have no idea how to fix it, so here: Copy & paste what is there into a google search and it should be the second thing that pops up when you hit enter :)

warning: I'm typing this on my phone and there's probably some typos or mistakes I missed when going through it so shh also I'm not the best writer and this is probably really short but it's long for me okay

leave any questions or comments you have in the reviews! I'd love to hear what you think about this!

•••

A long time ago, in Gotham City...

'Monsters are real.' was the only thought in Jason's head as he ran through the alleyways. 'Monsters are real. Monsters are real and they're in Gotham and pocket knives don't hurt them.' He ran past his old apartment, knowing that even if he tried to find safety there, it'd only put his mother in danger- not that it mattered much, she was already in enough danger from the drugs she'd been using, but he still wouldn't risk it. Jason couldn't do that to her. She might not have been the best mother, and she might not be able to take care of him or feed him, but he couldn't just let her die because he had messed up.

When he'd first seen the monster, it'd been looking around for... something. He didn't know exactly what. It looked like a normal dog, just a stray, like most dogs in crime alley. It was sniffing around, and he had just sat down next to it, not thinking anything of it. Then the dog turned towards him, and growled. Jason had only a few seconds to try to understand what was happening before the dog grew much bigger. As it grew, it's appearance changed. It's head morphed into the head of a lion, its body into the shape of a goat, and it's tail turned into a snake. Jason's immediate reaction was to pull out his knife and swing at it, but once he realized his knife had done absolutely nothing, he took off running. The lion-dog-goat-snake thing let out a roar, and Jason bolted down the street as fast as he could run. The monster ran after him.

There was an actual, real life monster after him and his knife hadn't done anything except make it mad. It had gone straight through the monster's head, as if it was a ghost. He winced as a growl sounded behind him, and he started to run faster, towards the next corner. If he could make it there, he could climb up the boxes and onto the dumpster, which was high enough to let him reach the old fire escape on the building.

Then he made a mistake. He tripped over a brick that must've fallen from somewhere. It didn't really matter where, because his ankle made a sound he really didn't like and his entire leg was filled with pain. When he looked up from his spot on the ground, this enormous monster was leaning over him and he knew that this was it, all that time spent digging through dumpsters and having to pick pockets and all that just to survive was going to waste and he was going to die by getting eaten by a monster that no one else seemed to be able to see-

And then suddenly the tip of what seemed to be a spear appeared through the monster's stomach and the creature burst into dust, and disappeared. A girl who couldn't be much older than him stood behind where it had been. She turned to the boy. He just stared at her, shocked by the sudden death of the monster and the fact that monsters existed and how this girl had just saved his life.

The girl turned to him. She had short black hair, and these intense, electric blue eyes. Jason had seen those eyes before, on television; the girl looked like a younger, punk version of Wonder Woman. She put away the spear, knelt down next to him, and spoke. "Are you okay?" Jason started to say yes, but let out an, "Ow!" as he accidentally moved his ankle. The girl looked at it and said, "Hmm, I think that might be broken. Here, I have something for it." She took off her backpack and opened it up. "What? No!" He tried to scoot away from her, but his ankle stopped him. The girl looked at him, confused. "What do you mean, no? I'm gonna help-" "Don't- I don't need help! I don't need anything! Drugs won't help!"

Jason couldn't help but be wary. His entire life had been spent in the worst part of the worst city in the world. He'd seen what drugs had done to people, including his mother, and he was scared that the dark-haired girl was going to give him just that. She blinked, and put her hands up to show she hadn't gotten anything out. "I swear, it's not drugs. I'm not that kind of person. Here," she said, holding one hand out to him. "My name is Thalia Grace. I'm a... monster hunter, I guess you could say, and I just saved you from being eaten alive by a chimera. You're welcome, by the way. I'm like you. I promise I'm only trying to help. If you don't want it, that's fine, but if you're gonna stay out here on your own, you might want to let me fix your ankle. It's pretty hard to run from a monster if you can't run. Trust me, I've been there."

Jason thought for a second, and then took her hand and shook it. Something inside of him was telling him that he could trust her. "I guess it's okay, then. I'm, uh, I'm Jason Todd. Thanks for saving my life, I guess. So the monster, it's called a chimera?" Thalia seemed to freeze when he said the name "Jason", but she shook it off and answered him just as fast. "Yeah. It's a Greek monster. You know any of those myths?" Thalia said. Jason shrugged. He hadn't been to school in a month since he'd started living out in the streets, since he had more important things to do then get in even more trouble for making dumb mistakes and not being able to read or even sit still in class. "A little. My teacher once read us a story about them in school. There's all those gods, right? Poseidon, Zeus, Hades, all of them?" "Yeah, them. It's kind of a long story, but... they're real."

Thalia had started to put a makeshift splint on his ankle, using broken pieces of wood she found and some duct tape she had in her backpack. "In the myths, which aren't even really myths, they're all true, but that's not important, the gods had a lot, and I mean a LOT of kids. Those kids were demigods. Those demigods would be most of the heroes you've heard of." "Like that Disney movie, Hercules?" "Exactly. He was a son of Zeus... actually, he's technically my half-brother." Thalia let out a laugh at Jason's look on his face. "The gods are still real today, and they're still having kids. Those kids are called demigods. I know it sounds crazy, but I'm one of those demigods. I'm a daughter of Zeus. And based on how that chimera found you, I'm pretty sure you're a demigod too." "I'm sorry, WHAT?" She smiled.

"Well, first, monsters don't bother mortals. The mortals, that is, normal humans, can't even see the monsters thanks to the mist, but that's something I'll explain later because it's really complicated. Second, you have ADHD and Dyslexia, right? Don't do well in school?" He blinked. "How did you-" "Put both together and it's almost a sure sign. Almost all demigods have either one or both. The dyslexia is because your brain is hardwired to read, write, and speak Ancient Greek, not English. Demigods have ADHD because of our battlefield reflexes. We have to be able to notice everything, pick up details, and be able to fight back at a moment's notice. It sucks to have these things, but once you find out you're a demigod, it starts to make a lot more sense. I have both too." Thalia stopped talking, and reached into her bag. She took out a biggie of what looked to be little brownies. "Here. These are ambrosia squares. Food of the gods. Demigods can only have a limited amount, or they'll burn into ash, but this stuff is really handy at helping us heal much faster." Jason hesitated, but took the food. It was the most delicious thing he'd eaten in... actually, it was the best food he'd ever eaten. "Wow." "I know." She smiled.

"Here, now try to get up." With his new friend's help, he managed to stand. He noticed that his ankle was already feeling much better. "It already feels better! How is that even possible?" "Like I said, it's the ambrosia. It really helps." Thalia looked away, towards the entrance to the alleyway they were in. "Jason?" "Yeah?" "I need to ask you something." "Okay, shoot."

Thalia took a deep breath and looked at him. "I have a group of a few other demigods who I've been traveling with. We're all runaways. Luke's from Connecticut, and our little friend Annabeth's from Virginia. We've all been on the run together for a few months with Annabeth, and Luke and I met up a few years ago. At first, we hadn't had a goal, a place to go and just wandered the country and trying to stay clear of monsters. However, recently we've been hearing rumors of a safe haven, a place where demigods can stay out of harm's way and live in peace. We can train there, learn to speak Greek like we're supposed to, things like that. We're trying to find this place so that we don't have to worry about monsters anymore. We think it might be somewhere on Long Island. It's quite the trip, but I... I want to ask you... do you want to come with us?"

At first, Jason hesitated. Did he really want to leave Gotham to go find this safe place? Sure, not living in Crime Alley or this horrible city sounded great, but did he want to leave his mom?

He looked down. She wouldn't be able to take care of him anyway. Probably wouldn't even realize he was gone- after all, she hadn't once in the last month noticed he had even come back to the house after being gone for so long. He thought about the monsters, and how they'd keep chasing him. He had to decide.

So he did.

"Yeah. Thalia, I'll go with you." She smiled. "I'm glad." They started walking out of the Alley and into the city. Thalia and her friends had been planning to meet up in a park on the other side of Gotham at the end of the day, so they had a while to go.

Over the next few months, Jason and Thalia became close. She saw Jason as a little brother, kind of like the one she had lost all those years ago when her mom took the two of them to the park. Thalia saw Jason as a kind of second chance at protecting her brother, which was even more ironic because they had the same name. Jason saw her as an older sister, something he never had growing up. Jason became close with Luke and Annabeth as well, and eventually Grover, but it was always the two of them who had been closer to each other.

Jason had to be held back to stop him from going in and getting himself killed the night they reached Half-Blood Hill.

He still visits Thalia's tree every night at Camp Half-Blood and tells her how his day was.

•••

That's the end of the first part of this. I'm gonna be writing the chapters all like this, it's not really a flowing story but I mean I like it so, there's that. Hopefully I'll write another chapter soon. It'll probably be about his time at CHB and his friends there and how he gets claimed but who knows. Please review if you like this!