Which ever oc you would like interacting with either Elbent or Verglaust?
Let’s use Starfall since he has a few things he can probably relate with them
If Elbent was already aquatinted with Starhawk, she might recognize Starfall to a degree since the two share the same frame type, just a few differences in armor and colors. And there’s also the fact that Fall is an amateur mnemosurgeon that makes him stick out from the other few star seekers.
I don’t know if Elbent has any fear/hatred towards mnemosurgeons, but she would have to be the one to approach him. Starfall isn’t exactly shy, but he’s not used to being around people, especially more friendly people. He’s suspicious of strangers, regardless of origin or faction, and he has good reason to be wary. The only person he feels very comfortable with is Hawk since the two call each other brother.
They might get along decently with time, if Elbent doesn’t get suspicious of how secretive Starfall is and his habits of disappearing for very long periods of time. (She can try asking Hawk about what his deal is but even he doesn’t know)
Fall has a habit of learning about the history of those he spends more time around, so he will eventually learn about Elbent’s past, wether she tells him about it or not. Learning on how she was tortured by Sunder, the mnemosurgeon that he’s being forced to model himself after, he might feel a sense of guilt and sympathy. He understands what her situation was and would then put an effort to try to be friendlier, despite his awkwardness.
Sort of the same with Elbent, Verglaust would have to approach first, though with his history with the cons, he’ll have a harder time getting closer than Elbent would. Honestly he’d probably need Elbent and maybe even Starhawk with him for Starfall to get close.
Fall would put more effort into learning Verglaust’s past since he’s afraid of him, but that means he more quickly realizes that he was used as a weapon, and hates that he was seen as just that to the cons. Something about that hits a little close to Fall, and he might eventually tell Verglaust about how he’s in a similar predicament, but he’d still leave out details about how Corvalis is keeping him captive for her own gains.