I think that's a good idea! From my understanding, Tiangou is a reckless, tunnel-vision type combatant while Constantine focuses more on strategic plans of attack since he's based off of an emperor. Please correct me if there's a different characterization you were going for, [@Letter Bee]:)

As for a secondary focus, I can add magic damage to Tiangou if that works. I would recommend buffs for Constantine to add a little inspirational leader/general flavor.