Even Gun's underdeveloped characters are often rather deep and thought out. Rooker's Caliban from the suicide squad. For a disposable fakeout opening character. Following along with him at the start you get to know a bit about him just watching. Kind of like him a bit even. Then boom! Chum in the waters.

I haven't watched the new season of Peacemaker. But if he can handle anti-heros like he did with season 1. I think Supergirl of in good hands.