A female’s Vagina is physically similiar to the physical charateristics of this guy; pink and soft. But he can also be an evil little bastard, representing the darker side of sex, and is a contrasting (but still pink) childhood memory.
Frank uses two pink childhood memories (cotton candy/Majin Buu) to bring back a time when the vagina was just your source of life, before when you started chasing it.
Majin Buu also represents the power of the vagina. Vagina, or more specifically, the sexual prowess of anyone has the dominance to transform people often making them sweet and caring. Buu’s most known power was to turn people into candy and sweet and eat them to become stronger, which is also sweet, in a sickening way.
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