It's an up to you situation, but the descriptions give some indications on what can be used. Here's some ideas I've had.
Beastslayer: I would probably add the head or skull of a monstrous creature to the model.
Wolfkin: I would probably drape the model in a wolfpelt, preferably over the back with the head of the wolfpelt connecting to the head of the character in such a way that it is conceivable that the Fenresian Wolves see him as an Alpha Wolf. Of course you can also throw him on top of a Thunderwolf if you're really serious about it.
Hunter: I might have the model wear a camo-cloak or be painted in subdued tones to represent his stealthiness.
Bear: I'd probably try to bulk up the model if I could. Make him look bigger, tougher and meaner. That or obvious cybernetic implants/replacement parts - 'Yeah they may have chopped off my leg, but I chopped off his head' kind of thing
Majesty: This one is all about the bling. Make him shiny with lots of gold and silver metal.
Warrior Born: Trophies again, lots of trophies, try to squeeze a small trophy from every one of the playable races in there if you can.
Iron Wolf: This one is kind of tricky, seeing as only the Iron Priest can have it anyway. Again I want to go cybernetics, indicating this Iron Priest is more Iron than most.
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