King Shark: goes berserk at the smell of blood, is squeamish around gore, casually bites off the heads of people and animals
Doctor Psycho: can handle himself in a fight against Wonder Woman, can use his psychic powers to throw multiple cars around, can't use his psychic powers to pick up slightly heavy furniture
Ivy: can break out of Arkham with a single plant seed, can come back from the dead and grow massive vines that break into Joker's fortress, can't storm through four of Penguin's armed guards, the brainy levelheaded strategic person, walks into Riddler's lair unarmed
Clayface: can't act, CAN act (well this inconsistency is believable, his acting could have improved in the several months that went by in the show, or maybe he's naturally trans)
Harley: I'm not gonna touch all the inconsistencies in her character.
Also, Jesus Ivy is hot.