Oldman- Wayne... Who wouldn't think Batz would end up a feisty old man still in the game, beating people over the head with a cain. He's ancient and weathered but still can KICK SOME A$$. I love it.
McGinnis- very different batman personality. Kind of like Peter Parker always cracking witty jokes.
Ace- Dog super heros...not a fan....however...I think the best carnation of Ace The Bat-Hound is in Batman Beyond. In fact I really like him. Why? Cause he's just a normal dog that hangs around oldman Wayne. No costume(#1 reason dog super heros suck...costumes.) On a occasion he get in the mix and starts biting people but that's only when the fight is brought to his old Geezer of a master.
Love this series. It meshes well with the batman Mythos.