I already have psychonauts so if this is the correct answer then please give it to someone else. It's obvious that the person has multiple personalities, each with different hair colors and different wigs.

Big +1 for knowing the band without using google. And yeah they look like a group of hoods now.

Oh, or maybe they're all himself? Blond when he's a kid, black or brown when he's an adult, gray when he's old, and white when he's ...really old.

He is his own grandpa! like from that one movie haha
From this one
http://www.youtube.com/watch?v=Cjd__U9RhkI

Someone who isn't interested has already PM'd me the correct answer, so this isn't that difficult. You just need to read what I said.

EDIT: and then follow that clue.

Hair dye >_>

different hair color

Genetics
It's got NOTHING to do with hair color DUH!

They are all clubbers!

drag queen with multiple wigs

I still say it's your monday through friday entries on your lookbook!
As I just said in reply to TinyE!

Is it Seal hunting season already?

Is it all right to take multiple guesses?

Um, if so... "four people with a different hair colour" could be interpreted as four people who have a different hair color than the guy, but have the same hair color as each other. So, I guess the guy could have recessive blond hair, and his parents and two children all have brown or black hair, and he's related to them 'cause they're his family.

How many guesses do we get because I need to tweek my answer.

A mouth and or words.

Many as you want.

This is not solved by guesses

I dunno, four different women? I wish I knew the answer already ._.