I've been meaning to ask for a long time. Is it hypothetically possible to make friends with Scroop? What do you need to do to gain trust?
For a simplified answer: It depends on how you interpret or expand his character, since we don’t really have many sources to determine if he has friends or if he can make friends in the canon of the film.
For me, it is possible to be friends with him. Though there's a catch: Scroop's definition of 'friends' is more similar to a distant worker friend than a personal friend. In a way, the ship is a workplace where he could never clock out and go home. And the fact that he is described to be both secretive and blunt.
To earn Scroop’s trust, though not 100% accurate, since he can sometimes be lenient or very strict depending on his mood. You need to (the following are headcanon territories, and these can probably change, since I am still working on what happens when you earn Scroop's trust)
Be a rigger, so you two will have the advantage of needing to communicate more than the other members' positions
'Automatically' know that he wants privacy or is sulking. aka he wants to be alone whenever he wants during break time, which is mostly impossible to tell if he is free to talk or not, since he never communicates verbally, and immediately the work time is over, you can't really find him. (Unless the topic is about rigging issues, he can squeeze out some mental strength to sacrifice his privacy a bit, but make sure to tell him immediately so it won't become a big problem.)
That you are competent to be in the crew by his standards, especially if you are a rigger
Don't make unnecessary noises, aka be quiet, as well as don't ask him questions that are like 'nice weather isn't it?', he is not Silver.
Absolutely not lecture him or give him a pep talk or talk to him in an accusatory way. He doesn't need another Silver. Scroop also takes things very personally, so lecturing and pep talking make him feel like you are rubbing your superiority against him. This is crucial to know if he knew he made a mistake, and he turns into a bomb when feeling humiliated. So is best to not follow him just to give him a pep talk, or give him a 'serious' talk when he is sulking. (This is VERY hard to do since if your tone can be assumed as condescending, he will get defensive)
Show that you hate Silver or, at the bare minimum, you have a distaste for how Silver plans or makes decisions. Scroop believes Silver is an overconfident smartass and [Silver] overindulges that he likes being right all the time (which,-Silver kind of needs to be right, since he has the responsibility to be a competent leader), and then be the one who tends to choose the 'wasting time' option that just puts the crew in more risks. Or if you actually admire Silver's strength as a leader, just don't say anything
(When you earn Scroop's trust, hypothetically, he would be less judgmental when you made a mistake, and I think there is a chance that his mental energy will sustain a bit more, but there will still be days when he is in a very irritated mood)
Two of whom Scroop might consider as friends could be Oxy and Moron. If we believe Jim's Journal to be canon, with the fact that Oxy and Moron are friendly with Scroop. Then the assumption that they're worker friends seems to gel well. Birdbrain Mary seemed to be a possibility as well- (I kind of headcanon her as a more straightforward big sister who kind of acts like a translator for what Scroop is feeling internally, sometimes it's exactly how he is feeling, sometimes she will troll you. Since I kind of see Scroop is much more blunt when talking about others, but when talking about himself, he is much secretive, at least hypothetically-)
In the film, it was first Oxy and Moron who questioned Jim's suspicion. Then Scroop dropped in and told Jim to mind his own business.
These three also seemed to sit at the same table, but it can be argued that Oxy and Moron are talking to each other while Scroop was sulking about the fact that he got a warning, and so he is avoiding eye contact with everybody.
Another scene is during the supernova storm. This is one of the scenes where I headcanoned that Birdbrain Mary can also be considered somewhat of a friend of Scroop's. But it can be argued that it is a coincidence that they just so happen to be working together- eh
Also one small thing is that there is also a scene where he was responsive as his gaze followed Meltdown getting pushed off by Silver, which- I don't know if he thinks Silver is wasting his energy or that Scroop is attentive to his surroundings or is being aware of his personal space and doesn't want to be pushed by Silver either or that he is annoyed that Meltdown is making noises when pushed- just ughhh.... (I am leaning more that Scroop is a bit attentive to sounds, with a small bit of him not wanting to be pushed by Silver, so yeah-)
These claims can fall short since I am pulling up every single time where they share a scene together, and none of them interact directly with each other. (Birdbrain Mary telling Scroop to slice and dice Jim can be assumed to be just conforming to the bandwagon with the other crew members, and that when Silver twisted Scroop's arm, you can hear Birdbrain Mary laughing (well- maybe she can be a friend, just not a perfect or good one), and maybe Oxy and Moron(???), but they're not gathering around Scroop and Jim so :P)
Again, it really depends on how you see and interpret Scroop. Even by canon standards, we never really got to know Scroop in any depth. He was written to be an abstract secondary villain who has limited screentime, and what we do know of him is that he is meant to be a foil both to Jim and Silver, and right on his debut, the story makes it clear to us that Scroop should not be considered a friend.
(but come on, how should that stop the fandom lol, I am currently slapping Scroop with some of my more self-indulgent headcanons (that I didn't mention) even though I know I still need to keep him faithful to the original film haha)
I am definitely interested in hearing what other people think about this, so please share those thoughts if comfortable! :D