The worst in recent memory is the soulless purple wad with vacant eyes they call Nabbit. He's the embodiment of NSMB's aesthetic, its dark soul given form.
A thief character is a fun idea but Nabbit is bad. Just so bland, I would believe it if Nintendo came out and announced he was a refugee from Mario Party 4. Heck. I know Nintendo has weird reservations about using the RPG characters, but Popple from Mario and Luigi would have been way more fun. The reuse of Bowser Jr's mask isn't endearing either. It just makes the design seem lazier. Not a good guy.
A thief character is a fun idea but Nabbit is bad. Just so bland, I would believe it if Nintendo came out and announced he was a refugee from Mario Party 4. Heck. I know Nintendo has weird reservations about using the RPG characters, but Popple from Mario and Luigi would have been way more fun. The reuse of Bowser Jr's mask isn't endearing either. It just makes the design seem lazier. Not a good guy.