If you want to do the challenge I set up here's the rule.
Rule #1: The OC can't be on friendly terms with Batman.
Rule #2: Batman will be the one losing (if you want Batman to win, he has to be defeated at least 5 times)
Rule #3: OC has to be a boy.
Rule #4: The OC has to be the age of 8-14 (it is a shotadom after all)
Rule #5: The OC can't be the son of an existing character.
4 things to keep in mind
Batman can be raped by the OC if you want to.
The OC can have allies.
You can kill off Batman.
It can be any kind of story you want; a one-shot PWP or a long story with character devolpment. (just please follow the rules)