My army is lead by Kaya the Wildborne. With her passive buff to warbeasts, spells and feats which helps with fury management this warcaster is really nice in warbeast heavy armies. Which suits my rather well since I only got into Horde-Warmachine to see loads of big beasts and jacks, sadly I find that the game often favour infantries.
I sometimes use her as Kaya the Moonhunter while using the white War Wolf as her light Warbeast Laris. The War Wolfs are otherwise used to fill leftover points.