It's been a toss up for what class I'll main in legion between protection paladin, guardian/restoration druid, and shadow priest. But recently I have been leaning more towards Druid for my legion class.
My favourite druid NPC is none other than Hamuul Runetotem! He's really the character that made me want to play a tauren druid, and is one that I've always admired. I really enjoy his personality, plus he just looks awesome!