I thought about this and realized Majin Buu really had no intentions but just to kill nikkas and eat cake.
-Raditz (wanted to reunite and recruit Goku to help the saiyan race)
-Vegeta/Nappa (wanted the dragon balls for immortality so they could defeat Freiza and avenge their race)
-Freiza (Wanted domination and profit)
-Cell (wanted revenge for Dr. Gero)