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Demon's twin au, except....
A Demon's twin au where Danny and Damian are polar opposites of each other as usual. Damian is the serious and pokey one while Danny is the laid back, carefree twin. Except, Danny is 10x more psychotic than Dami, and his demeanor is somewhat a manipulation tactic. He's still loves Dami vv much and would gladly burn the world for him while Dami is....hm. He envies Danny but in the same time very intimidated by him (read: black cat & golden retriever situation)
One day he gets killed by Damian (may it be a duel that he didn't think seriously because he thought Dami would never kill him or Dami just flat out conspiring against him is your choice) and Danny was FURIOUS at him. Instead, he swore Damian would pay the price for betraying him.
Fast forward after he got resurrected and lived as Danny, he's soften up a bit; more talking and less stabbing, basically. One thing leads to another where he leaves and ends up in Gotham (preferably because of CW) and hey, what dya know. Dami's siblings aren't that bad...
Meanwhile Batfam™ are scrambling because there's a teenager that looks like Damian wandering over Gotham. Damian is perplexed because that could be his supposedly dead brother (eye color).
Everything went wrong when Danny straight up jumped at Damian in costume, trying to kill him.