One dimensional characters: Character will not progress personality, has strict pre set morals, strictly Good or Evil, cliché, stereotyped, flat generic dialog.
Two dimensional characters: Fits neatly into story, No History or limited, Predictable, character is non social(interaction), dialog is simple and one sided, Archetype, superficial, Ideal.
Three dimensional characters: Flawed, Has own stories, Has a unique past, Irrational, Quirky, Often Social(interaction), Individual, progressively changes, often unlikable.
Hulk and Iron Man fall under two dimensional. Nolans Batman films have Three Dimensional characters.