Reaper - Helix would be fascinated by her and her abilities. She can't bring people back, but her thralls are basically short term zombies, so she's not creeped out at all. And she basically kills herself as a modus operandi, so yeah. Definitely not creeped. I think Liz would like her a lot more if she knew Reaper had a dissect-y urge. Certain is creeped.
Leah - Awesome! I think Onslaught (above) may be able to trigger her if they've roomed together for a while and get along, we'll have to hash that out. I'd love to have Leah be able too, as well, though! It'd help Helix out a lot. Beth is the healing ace. Liz is much better at massive damage when needed in a bind, or when asked too in practice. She can make that choice for herself fairly well at this point, but would defer to Leah's judgement in the field if she sees something Helix doesn't. That doesn't mean she'll love being moved around like a marionette (I will though!) but she'll listen.
Blitz - Cortana's collecting game frands, she's all for that. A brief awkward thing with Blitz could be a funny reference now and then, so that works for me.
Medic - Boo, buddy. Liz is bored. Beth however, probably has a soft spot for him, Grumpy Cat and all. Cortana won't be dragged down by anyone who frowns at dance parties, but she'll be polite.
Livewire - This could be fun. I vote for alternating. I think Liz will think of her as a badass kindred spirit pal, even though Liz has never gotten murder-y outside of her orders. She's not judgey about that though. Beth is though, very much so. She'll give Livewire (and probably most of the Juliets) a wide berth and do a lot of head shaking. Liz is totally cool with the flirting, too. Cortana doesn't mind but will probably just laugh it off. She's welcome at the wet floor dance parties any time!
Aha! I'll keep an eye out for her, I'd love to plot with them if you're game. Thanks for the response! :D