Just so you know, it's actually Majin Buu with two u's, not o's. But keep excepting o's in case somebody spells it that way, which I have seen. Great Quiz!
Actually the O's is the way it's spelled in the Viz Manga series. I try to use the manga names because of the different ways of spelling it for all the different English Dubs (Example, Goku's name actually has four different spellings: Goku, Gokou, Gokuh, and Zero if you want to consider the old Harmony Gold Dub). But I try to make it so it allows all of them type-ins.
Not sure why everyone gets this wrong (I don't think I've ever seen it right). Frieza has 5 (or 6 if you count DB Super) transformations:
1) How you first see him, with his purple armor. 2) slightly larger, no more armor (I'm sure this is the one most forget, but he does call it a transformation, Vegeta even comments on this) 3) much larger, horns grow 4) grotesque form, long head, larger still 5) Final form, white and smaller again
Brawley*
Namek's Head*
1) How you first see him, with his purple armor. 2) slightly larger, no more armor (I'm sure this is the one most forget, but he does call it a transformation, Vegeta even comments on this) 3) much larger, horns grow 4) grotesque form, long head, larger still 5) Final form, white and smaller again
Also, Most people call that Buu just Buu.