you already ahve traits describing their itelligens/charisma/vigor.
and selfish/../..
how abotu such a trait, that determine steh furtehr growth fo a character: His temper. giving him chances to be "bad mouthed", "Tantrum tank" or "pansie" "weakling" "loser of life" or gives him somehtign positive like "asertive" giving him extra movement, or extra command when attacking?