I'm sure a lot of you remember the one shot "Galacta: Daughter of Galactus". I know it wasn't exactly well-received but I know the potential for an intriguing character is there.

If you removed the twist ending at the end of the comic, we could follow the coming-of-age story of a teenage girl who is the spawn of the World Eater and has trouble not only trying to control her ravaging hunger but learning to control the full infinite capabilities of The Power Cosmic all while trying to hide her identity to all but a few heroes, her father, and his remaining Heralds.

It would be like "Sabrina The Teenage Witch", especially if Galactus sends in one (or more) of his Heralds to watch her as parental guardian(s).