I would recommend thinking of what kind of teenaged archetype, character upbringing, and overall personality more than wondering if you like turquoise or lavender more. 

If I made a playable character in the main five I would gravitate as the antithesis of the leader/red, the techie/nerd savant type, or perhaps the one who doesn't fit in at all. I always seem to like the more "lancer" type characters, which in my experience have the most fun when they are particularly moody.