tl;dr- what would be a good name for the new NPC?

NPCs like him that are going to be interacted with a lot and stand out probably deserve a name.

Maybe a name fitting for a player character? Boss_Slayer_1101. KittenCuddlez9000. Other Frank or Frank Jr (no relation to Frank the other clan founder)

Maybe a name with the standard pun? Mr. E (mystery) or Sir Render (surrender)

Maybe a name associated with war? Ares, Camulus, Tyr, Kratos, Mars, Baal, etc.

Perhaps a punny name associated with war? Warren Peace (war and peace) or Warren Profit (War and profit) or Warren Order (war and order)