For a 40k game, I'd represent them as three models per a HQ slot, so two company command squads would have three of these characters per. This should give you enough to customize their weapons/gear to represent them close enough.
Make some great models for a selection in Cityfight, however I haven't played a game with those rules yet.
I'd would have made them as memders of the wolf guard. You would have far more flexibility in their gear and they could lead squads if wanted to.
Of course, you could go totally nuts and make two complete lists. One force will have a blue scheme while the other red, adding the characters to the correct team.
I'd personally go space marine than IG, myself. But to each their own.
A forum community dedicated to Wargamers, Wargaming 40K enthusiasts. Come join the discussion about Warhammer and Wargaming collections, miniatures, tactics, terrain, reviews, accessories, history, displays, models, styles, scales, reviews, accessories, classifieds, and more!