Being Human: First character Concepts

I have done rough concept drawing using my chosen arm concepts, but because I've done that i have four character. I will be narrowing down to three so that I can make the characters a Freud Trio. The designs are based roughly of myself.
The Main character is called Rob, he is represents anger and Ego. The leader of the group

Rob's Best friend Steven, he represents Sadness and Super Ego. despite being sadness the word of reason

The third wheel Simon, He represents Fear and most likely the character I shall be dropping as he doesn't fit into the Freud Trio. 

The friend you can always relay on Kevin, he represents Joy and ID. Kevin and Steven may not always get along (due to ID and Super Ego conflicting) but friends to the end.