This is Natasha. I have a bunch of characters, but I'm going to mention Leo Fitz from MCU: Agents of S.H.I.E.L.D. first because Fitz is an engineering genius and he (and probably Jemma) would be glad to help get that collar off.
From their order on the Activity Sheet, they all are:
Mordecai Robertsseptman 30, arrived 2 years and 3 months ago with the first mass group of refugees. He's a magician from the Chrestomanci novels, sits on the board of directors of SadTech (the company responsible for waking everyone up), and is generally a friendly guy. He's also trying to pretend with less and less success that he's not involved with Lucy Pevensie. This does not endear him in any way to my next character.
Edmund Pevensie (this journal), 23, arrived in November 2367. Edmund is one of the early arrivals still around. He is the head of SadTech's legal department and works closely with Intel. He's generally polite and friendly if he doesn't suspect someone of toying with his sister's heart.
Clint Bartonhawkinthenest, MCU, 50s-ish, due to memories of Endgame. Clint is over security for the compound where the refugees live, and answers to Seth Gecko (more or less). He tends to adopt strays (including Allison which means Stiles will probably end up in that category when he arrives). Clint considers Bellamy a friend and they work together, so he'll run into John if for no other reason than that.
Marcus Colefortheone, Babylon 5, 39. Marcus has a few games worth of prior history to separate him from his canon. He works in Intel and Investigations and is good friends with Lexa. He's a literal space ranger (pilot, fighter, etc.) and sounds very British even though he grew up on colonies away from Earth. He has a taste for classic literature.
Jacqueline Wildgrubetowhomnature 21. Jac is a local. Her brother Ezra is a high up in the Resistance and the newest member of the SadTech board, and her dad is the CEO of another corporation BNU which makes him more or less the Big Bad. Jac is sweet, smart, and likes to party more than think about things that upset her.
Bodhi Rookitisourfight 25, Star Wars: Rogue One. Bodhi is adorable and awkward, and the head of Transportation and Mechanics, so he's involved in resupply.
Eddie Castileonesconvictions Vampire Academy, 19. Eddie works in security under Clint and Bellamy. He's also good friends with Allison. He's serious about his job and his friends.
Cullen Rutherfordknightcmdr Dragon Age, 31. Cullen is the Security Trainer. He generally has a bunch of big dogs around him or his Thedas people or both. He's a bit too serious, but he's a good guy.
Raksha Kellersoulofhonor Night World, 19. Keller is a panther shapeshifter. She is another too serious character. She works headquarters security under Natasha Romanoff.
Dash Parr - 18, The Incredibles + Save Atlantis, basically Dash just grown up, friendly, overconfident, tactless, reckless
Allison Hargreeves - 30, TUA+Some Reality. You know Allison. She is Executive Assistant to the CEO here.