Tis I, Foster! I'm so happy to see Hope in the game. So far, I have my three amigos here.
Harry (Potter) is from this time and place. He was assigned here with his best mate Ron to basically keep the peace and help the newcomers adjust. Really, he's not sure why they're being trusted with this but he suspects the Ministry is hiding something (little does he know). Anyway, this has been keeping him busy enough and he's been asking questions while hes' there, so he will definitely run into Hope at some point in the near future to interrogate her.
Natasha (Romanoff) arrived with Steve, Bucky, and Tony. She comes from the Soul Stone (literally, from inside the Soul Stone), though the memories are vague. She remembers dying. She remembers something after that, but now it's not clear. She's been living with the boys and adjusting to lie in Cardiff, but now that the compound is here she's going to be moving there and definitely NOT causing trouble or anything.
The Doctor (13) has been here a few months. In fact, she was one of the first to arrive along with other her (11). She's been having a blast figuring things out, but also hates being so stuck. She'll be happy to quiz Hope and tell her all about why none of this makes sense!