Roaring Rampage of Revenge: While he was locked up in Arkham between Seasons 1 and 2, a group of guards liked to beat the crap out of him on a regular basis (not that he didn't deserve it). In Season 2 he's spending his time hunting them down and murdering them one by one.
Pragmatic Villainy: Ultimately considers acquiring Arkham Asylum more trouble than it's worth, and agrees to sign it back over to Dr. Arkham. However, Arkham thinks this is merely Lex Luthor Code for "As soon as I get out of here I'm paying a hitman to shoot you in the face", so he has Two-Face shoot Lex in the face instead.
The Casanova: Is apparently able to charm men into bed in extremely short order, usually starting with just a smile. Although, since they are men, this may have more to do with certainothertropes than it does with this one.
Mythology Gag: "I like to keep my involvement with the Wayne family Hush, Hush.