Did you not watch the show? That was what the entire saga was about, breaking control and being free. The "M" symbol means Majin and is only seen once Babidi's spell is cast upon someone to bring out the evil in them as well as increase their power as they are not held back by their moral code.
Majin Buu
Majin Vegeta
Majin Debura
They were all taken as they were the greatest warriors at their time in history. Buu being an ancient warrior, Dabura (The Devil) was the reigning king of Hell and Vegeta was the strongest warrior at then present during the saga.
All of those forms of Buu were not inately "evil" it's just that the spell cast on him made him out of control.
Manipulation Sorcery
"
Manipulation Sorcery is a spell that
Babidi can cast over any being in an effort to take control of their mind and
release their power."
"the
Majin Mark which can be worn by the Warrior if they are an Earthling or Saiyan. When the accessory is equipped a Majin Mark appears on their forehead just like those under Babidi's control, though like all accessories it is purely cosmetic. The Majin Mark accessory can be purchased from the TP Medal Shop for 40 TP Medals after the 1.07.00 Update."
You brought out the dork in me
I imagine if I could fully dedicate this stupid nonsense of knoweledge into my programming work
I'd be a millionnaire by now
.