Freaky child 

Someone that is very picky with their food, as pale as a ghost, and does random and weird things

Charlie, you're a freaky child. Why can't you be like Bill?

Freaky child by FlameableGhost March 4, 2017

freak child 

a random person that does so strange things some times but is very nice and lovely
very similar to noob

you're such a freak child

freak child by krazydb February 22, 2009