So @Kangutso if you have the creativity go for it. If not, war and honor seems an appropriate combination and something that might also be fun.
Here's a tip: envision a character first, and then make the domain/portfolio around them. Not the other way around. I've found doing this somewhat harder, but I'm convinced that it lends itself to better results. When you think, "I want a god of air!" you're left with not much of a guideline, but when you envision an arrogant, meddlesome, and unpredictable loudmouth of a god, the idea of air comes naturally. It's fitting for a guy who's full of himself
I will try doing that, then. See where it gets me. Though I must say, doing personalities and histories/bios are the hardest things for me.
<Snipped quote by Kangutso>
Hmm, just read up on Janus. Seems very interesting. I'd say you're looking more towards a god of Change (Time) there, or Change (Space). It could also be Creation (Time), Creation (Space), Creation (Genesis).
On Cyclone's point, tell us a bit more about what this god's personality will be likes, his/her abilities and maybe their name. That might help narrow it down more
The second to last pairing I mentioned before. But for now I'll build him in the off time, and focus on War.
I'll see what kind of personality I come up with for him and post it for your viewing. And I can't think of a name, so if anyone can throw me names or ways to come up with one, that'd be good.