Buuza
Buuza is a combination of Frieza and Buu he appears in the Buu saga when Cell teaches Frieza instant transmission he teleports to when Gotenks is fighting super Buu and jumps in to super Buu creating buuza he is extremly powerful and was able to brush aside ss3 goenks with ease he then went and killed every z fighter
He has 4 forms just like Frieza.