Charlie would definitely be nice to Helena, because it can't hurt to be on the good side of the lady who can raise the dead. And my next one will probably be a Foxtrot, so stay tuned for more possibilities!
He doesn't like talking about his ex at all, but I think it would have been a good bonding point for he and Blitz for sure. And hey, trying to sneak up on him using speed is totally a training exercise and not just for the hell of it -- they're developing Bat's reflexes and Blitz's stealth. Or... something?
Oh yeah, Livewire will probably not be anywhere on his list of favorite people. He would never be outright rude or anything, but when avoidance doesn't work he'll probably just clam up around her or suddenly have something terribly important to go do. Maaaaybe he's mimicked her voice just to see if that would get her to stop asking about it, though it probably backfired miserably on him.