Batmom
Oc/Reader is female.
Her Dad was a Olympic gold medalist for Karate (You can choose different)
Her mother who was a MMA fighter passed away giving birth to her. (you can choose different)
Growing up knowing about her dad in the Olympics and how he won a gold medal.
And knowing how her mother loved to fight especially MMA and that's how her parents met.
She starts training at a young age to fight.
At first her dad was against it but after telling him how much she wants to do the things that allowed him to meet her Mom. And that she actually wants this. And if he won't help her she will do it herself.
She fights in the underground fighting rings becoming champion for 3 years in a row. She wears a Mask to hide her identity.
She is in her 20s when she first started dating Bruce Wayne. When he came back to Gotham.
She gets caught by batman. And Bruce is surprised to find out that his girlfriend is an underground fighter and his hold loosened and she manages to escape by Flinging him off her before running away.
He confronted her and that's when she figured out that Bruce was batman as the batman was the only person to see her as he had took of her mask before she managed to escape him.
He almost breaks up with her but after a talk with Alfred he doesn't.
They are engaged when they meet Dick Grayson.
She becomes like a mother to him and she bonds with him more easily then he bonds with Bruce.
He and Bruce hide that he is going out with Bruce. Until the news starts talking about Batman's child sidekick.
She knows straight away when she sees the news.
So she goes and confronted Bruce and dick. She bans dick from going out hoping he would listen to her
But dick just snakes out no matter what she does to stop him.
So she decides that she won't be able to stop him so she might as well teach him all the fighting techniques she knows.
Months later she and Bruce get married.
Years later Bruce brings home Jason. They bond extremely quickly.
And Jason even calls her Ma.
When Jason is killed by the joker she thought that Bruce would kill him but he wouldn't.
So one night as he is out Patrolling she finds the joker.
And beats him to death with a crowbar. But with her knowledge of the body she can Increase his pain, and she knows the Spots to hit without killing him.
She beats him straight for almost 5 hours (you can change it)
When Bruce finds out his is inraged and divorces her.
When Jason comes back he finds out that Batman didn't kill the Joker is was his Ma. And she only did it after batman refused to kill the Joker.