I don’t love the rules for the Runemaster, but I do dig the model. Plus, there are few enough non-character options for the Fyreslayers that I feel I need to load up on the characters.
The Runemaster gets the same slate chip base treatment of the other characters. It makes him pretty tall, but it helps him to stand out from the other infantry.
His hair also helps. The Runemaster felt like an elder, so he gets the obvious white hair to match.