So for Heroes of the Storm has 2 Dwarf heroes. Muradin the Mountain King and Falstad the Gryphon Rider.

I would be really happy if Heroes eventually has 5 Dwarf heroes so that you could get an all Dwarf team.

What Dwarf characters from Warcraft would you like to see?

Moira, Brann, Dagran Thaurissan, and a diamondized Magni could all work as characters methinks.

Brann, no question - they could play into his Explorer theme very well with the Heroes of the Storm aesthetic/gameplay they've gone with.

Moira could work, possibly.

Moira fills the female/caster niche and gets every member of the Three Hammers onboard.

Magni seems a little redundant with Muradin there. Brann definitely works.