Dragon Ball Z
Babidi Saga
Majin Buu (Fat Buu)
10 Billion
Majin Buu is able to take out Dabura, SSJ2 Gohan, Supreme Kai & SSJ2 Majin Vegeta with little to no effort. Goku later states that he could have defeated Fat Buu as a Super Saiyan 3.
Majin Buu (Good)

4 Billion
Evil Majin Buu
6 Billion
Fusion Saga
Super Buu
32 Billion
Super Buu (SS3 Gotenks & Piccolo Absorbed)
74 Billion
Super Buu (Trunk, Goten & Piccolo Absorbed)
36.5 Billion
Super Buu (Gohan, Trunks, Goten & Piccolo Absorbed)
80 Billion
Kid Buu Saga
Kid Buu (South Kai Absorbed)
40 Billion
Kid Buu
22 Billion
Dragon Ball Super
Battle of Gods
Fat Buu
10 Billion
Tournament of Power
100 Trillion
Dragon Ball GT
Black Star Dragon Saga
Uub
22 Billion
Mr Buu
20 Billion
Baby Saga
Majuub
44 Trillion