With more and more new traits being released recently, it led me to think of some of my own. Sure, some of these are outlandish, but I like to add a strategic element to a fight.
Bullet - increases own speed by 20% for 1 turn when attacked by a slower monster
Spirit - immune to all control effects and does not use stamina (I know Carlos said Spirit is the same as Artefact, but still...)
Greenfinger - immune to quicksand, burn, and poison
Spectacle - immune to blind, total blind, and stun
Suicide - may immediately kill the monster who kills him (unless they are immune to instant death)