Characters and what they are:

Batman(Bruce Wayne): The protecter of Gotham City

Alfred: Bruce Wayne Butler

Nightwing( Grayson): sidekick of Batman (could be his son if you think about it)

Batgirl(if you’re a true fan then you know she has multiple names but I choose Cassandra Cain): sidekick of Batman (could be her daughter if that’s what you want to think) (I don’t know batgirl much..)

Red Robin(Timothy Jackson Drake “Tim”): I’m not sure if Tim is a sidekick too of Batman (could be his son the same reason of batgirl)

Red hood(Jason Todd): Same reason of Tim I do not know much about him (could be his son the same reason of batgirl)

Damian Wayne(Robin or not): Is definitely Bruce son and is his sidekick

Villains:

Harley Quinn

The joker

Catwoman(aka Bruce Wayne ex if you want it to be)

Poison ivy

The riddler

And more

Extras(mostly characters that was mentioned/included)

Superman(Clark Kent)

Wonder Woman (Diana Prince)

Hulk (Robert Bruce banner)

Green Arrow(Oliver Jonas Queen “Ollie”)

Green Lantern(Hal Jordan)

The flash(Barry Allen)

The teen titans( Raven, Starfire, Cyborg, Beast boy, and robin aka Damien or someone else idk)

Pets:

Bat-cow (Bat-cow)

Ace (the bat-hound)

Goliath (Dragon Bat)

Titus (Dog)

Mango (Bat-Ape)

Alfred (Cat)

Wiggles (Dragon)

Jerry (Turkey)