KateKane

Realistically: Selina. Not realistic but awesome: Superman. Or Wonder Woman. They wouldn't be endagered by the relationship, they would understand him putting crime fighting first, and it would just be great.

Personal Joker theories? Is he a person, the personification of chaos, Batman's dark half?

I'd say Hulk, but probably not by much.

More focus on the characters like Black Widdow who don't have individual movies.

The battrain. Super fast, super ridiculous.