Raven at his finest moments is easily my favorite storyline character.
The second best is Tau, dealing with him is priceless too.
Edit: In third place Keghammer, his storyline and dialogues are great too, almost forgot him.
This is just me, but when he kept yelling about my hero being a daemon and my hero is all ‘oh no not again’ made me giggle because my username is Daemon, my guild is daemons and I’m from kakaroth…
I love the support heroes in this game, so much (crazy) personality.