I think they could both work. He could be like that grumpy member right now who tells people to get off their lawn? If anything, I know I was looking for a place for them to have their lair so maybe he's the background member with the lair and he doesn't participate on most missions but he's aware of them because the team meets at his house? But for their dynamic, I do think it could be like a twin thing where he's the grumpy side of what's it like to be a hero for years and she's the more "well, it's what we were born to do!" type so there could always be jokes in their fan base like if you're a veronica or a betty sorta thing