I've been lurking for a bit, but decided to toss in an idea of mine based off the Crisis In A Half Shell crossover comic from 2019. There's some cool stuff in the works already, so I could understand if I end up not getting in, but I gotta at least give it a shot. 

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[h2][b]| Character Identity |[/b][/h2]
Bruce Wayne, The Batman

[h2][b]| Age |[/b][/h2]
24

[h2][b]| Character Differences |[/b][/h2]
This is a Bruce Wayne raised with four little green brothers and taught in the art of ninjutsu by Master Splinter. He is not the stern, overly serious or darker man most would know, and isn't driven by his parents' death but instead is more openly hurt from the whole event, despite his attempts to repress old pain from his old life. In general, he is much more lighthearted, though a bit of a hardass when it comes to his brothers' safety. He's surprisingly sociable, with enough wit to crack a one-liner in the opposite direction one might expect him to, but can get rowdy and also put on quite the act of intimidation when necessary. He's almost entirely embraced family and teamwork, his stubbornness to do something alone simply coming from his desire to protect his brothers. Bruce lacks the sheer experience of his counterparts, still learning about himself and improving in his abilities. He also lacks resources he's had as a billionaire playboy in other universes, instead tinkering with Donatello to make whatever the group needs. Bruce retains his appreciation for life and dislikes killing, but doesn't share the same absolute moral code and hatred for criminals of Bruce Wayne's that witnessed their families die to a mugger. 

[h2][b]| Brief World Background |[/b][/h2]

Bruce's Earth is highly based off the merged world from the Crisis In A Half Shell crossover comic, many characters from Batman and TMNT being fused together. Such as Splinter and Alfred, and Joker and the Shedder forming the Laughing Man, terror and leader of the Smile Clan. Members being individuals such as Killer Croc and Clayface, fused with Bebop and Rocksteady respectively, and Harley Quinn fused with Karai. Rather than being a merged world created by Krang, this is it's own specific universe where Bruce truly was raised by Splinter, and the criminal actions of the Smile Clan have spread across the city of Gotham where it was up to Batman and the Turtles to bring justice. Though it's a long a chaotic battle that seems nowhere near it's completion, and given the circumstances, it'll probably be staying that way for a long while.

[h2][b]| Brief Character Background |[/b][/h2]
At a young age, Bruce Wayne had just emerged from a pet store having been bought four small pet turtles, before witnessing his parents end up in a tragic accident involving a speeding truck. Not only losing his parents in the accident, but witnessing his new pets along with a rat be covered in a mysterious ooze, mutating them into more humanoid beings. The rat, introducing himself as Splinter, took in the grief-stricken Bruce Wayne and the four turtles, the group of five retreating into the sewers to find a home. With Splinter's help, Bruce named these four turtles: Leonardo, Michelangelo, Donatello, and Raphael. 

Rather than pets, he grew up with these four turtles as his younger brothers, and with Splinter as a father and mentor in ninjutsu. Bruce excelled, showing talent and potential as he showed himself as an above-and-beyond talent, using his intelligence to make up for the difference in strength between himself and the turtles. While they all loved each other, there was a sort of triple rivalry between Bruce, Leo, and Raph. Leo wanted to lead, Raph didn't want a leader, and Bruce was just doing what he thought needed to be done and therefor would cause them both to budge if necessary. In the end, it was surprising that Splinter scolded that both Raph [i]and[/i] Bruce were too brutal and eager to lead, even if they had good intentions. So the leadership position ended up in Leonardo's hands, though the three came to trust one another's opinions a lot more over time despite some conflicts still arising.

As Bruce grew, he became more and more curious about human society in general. He had a tendency to wander around above ground, a leisure his brothers didn't have to the same extent-- And saw the good and bad the streets had to offer. The bad having more of an effect, as Bruce occasionally encountered someone in danger, lending them his talents. After awhile, Bruce began to take this more seriously, crafting an alias for himself to bring terror into the thugs on the street. Based on a traumatic situation with bats in his youth in the sewers not long after his parent's death, he became Batman. Something Mikey in particular noted as edgy, but he brushed this off to embrace his own unique identity that made him feel comparable to the uniqueness of his brothers. 

Bruce began to realize the more serious and dark schemes in the shadows of their city, his brothers didn't hesitate to rise up and fight with him to foil the crimes of the assortment of powerful criminals attempting to turn the city into their own. All of these criminals linking to one source: The Smile Clan, and it's leader, the Laughing Man. Who, despite the brothers best efforts, are still causing trouble to this day. Despite their multiple conflicts, no real resolution seems possible. Though Bruce personally does not want to stop until he can bring the Laughing Man to justice.

It seems Bruce is cursed to lose family in one way or another, and this ended up being in the form of an abduction. He was on one of his late-night prowls, or as Donny called it, 'brooding after losing too many times at video games'. He'd been eyeing a mugger in an alley, who was threatening a woman with a knife. Through a presence Bruce had no chance of detecting, he was rendered unconscious from an attack by an unidentified individual behind him. 

And by the time he woke up, his situation was much worse than he ever could have anticipated. At least he'd been geared up before he ended up dragged into this situation, but he only had two priorities upon realizing the weight of everything around him: Survive, and get back to his family. And over the last few months, that's exactly what he's been focusing on. Bruce has had to push aside his morals just for a hope of survival, and it's all for the sake of his loved ones. Though as he's fought, against psychopaths and persons of reason alike pinned in a situation like him, Bruce has gained a growing conviction to somehow end this once and for all. For the sake of every living being that has had to fall in this horrific world.

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