I just realized that the Roman soldier is wearing chain mail, so he's probably an auxiliary, maybe even a centurion, given the sideways crest on his helmet. Where in the empire is he from? Probably not from the local area, given how exasperated he frequently is with the Celtic bun.

Speaking of which, I initially though she was a Briton bunny, but I could be wrong there. Is she a Briton or a Gaul?

I do like how the Celtic bun has her patchwork cloak that she keeps adding to, it's a nice little character detail in addition to being a nice bit of visual flair for her. It's nice to see characters that have little hobbies or goals like that.