The Greek Bat (NonMythological Version)

Percy Jackson was Nine years old when his life changed. His mother died and he expected to be thrown into the system, only he was thrusted toward an uncle he never knew. That said uncle and his practically brother always disappeared when night came. Ten years old Percy found out where they went, what they did. He didn't want to be a superhero like his cousin, instead he was the mechanic behind the operations. But even then, Bruce wasn't always there for him when he sometimes wanted him to be, sure when he might've been sick or needed some boring school help he was but when it came down to it, Percy sometimes wished Bruce was never Batman. It was also weird relationship especially when Percy befriended Crazy, Not-So-Crazy person names Joker. It wasn't until he was eleven and a half is when he met someone who understood him more than the Wayne family, Luke Castellan a run away with no one but a schizophrenic mother, and he helped Percy. Started to treat him not like some rich dude's nephew, not some hot-shots younger brother/cousin, just...Percy Jackson the kid who lost his mother and never truly grieved.
Notes:
Darkish?
Abandoned!Percy
No Greek Mythology