Mine are:

Heroes: Vegeta (all forms exept scouter), Goku (all forms), Gohan(all forms exept kid Gohan), Gogeta and Vegito (all forms), Solid Snake, Jak and Ratchet.

Villains: Majin Buu (every form), Cell (Perfect and Super Perfect form),  Doc Ock, The Dahaka, The Russian in the Punisher and The Oracle in Fahrenheit (Indigo Prophecy)'

Now, who are your favourites?