Guys I Wanna Use More (w/ ways to plot with them!)
Elysia
She's one of my sea slug trolls, the Sagosa line!! As such her 'hair' is actually fleshy cerata like a sea slug. She's very peppy and upbeat and currently works at Vapore's smoothie bar as a waitress. It's an outdoor location by the beach and she's usually on rollerskates.
It's the best place to find her!! While you're there, if it's slow, you might be able to chat with her. It's polite not to flirt while she's working though--unless you're a hot butch lesbian, then she doesn't mind. Not at all
Lesath
Based loosely on the unkillable giant crocodile SCP as well as capybaras, Lesath has worked for the Fleet ever since they yoinked him as a kid and he's just resigned to it now. He's got an uncanny knack for not dying--he's not immortal or anything, just really hard to kill.
As such, he's usually assigned to dangerous tasks like guarding scary prisoners or anything with too much accident hazard for a normal guy to take the job. Right now he spends a lot of his time with Commander Mantle, working with Fleet employed psions, but it's always possible that he gets reassigned for a time to work with other officers/ships.
Maasco
This country dogboy is a shepherd and livestock guardian guy. He doesn't really have much going on besides living out in the country and caring for his flock, but he could always use some company that's not a sheep...
Orcinus
Orci is a pretty straightforward guy. He's a heirkiller, he kills fuchsia heirs that don't align with his rebel group's radical rebellious ideology. He's in incredible need of someone who can get him to loosen up and enjoy life outside of his work every once in a while. Or we can write toxic yaoi. The possibilities are endless
Xylova
Oh Xylova... This guy needs a total rehaul after his previous plots fell through. He's based on Xylitol Nova Cookie from Cookie Run Ovenbreak. He's part of a population of trolls that crash landed on a strange alien planet millennia ago at the dawn of Alternian space expansion and were never rescued. Now, they have a whole civilization that has somehow managed to avoid direct colonial reconnection with their homeworld.
Unlike Alternians, trolls of all blood colors from this planet have gills to filter out toxic heavy metal fumes from the air and require a mineral-rich diet since their planet is almost entirely metal. Additionally, there's not much of a hemospectrum system, since really only red - pink - purple - blue colors exist and the way their civilization started wasn't exactly conducive to systematic hierarchy--if they didn't all work together they probably would have all died lol.
Plotting with him would require a large undertaking in me basically remaking his entire planet, but you could have a guy on it too if you want!
Erraizi
Lastly, on the topic of aliens-- not exactly a troll, Erraizi is one of my OTHER aliens!! They live on the planet Adehiiri. It was invaded by Alternia a few decades ago, but there's very minimal colonial presence due to how challenging it is to actually build on the planet's surface. Adehiiri is characterized by very strong magnetic fields that generate giant, miles-deep cavern systems where in some places the surface is only a few feet deep. The arran'roa, the native sapient species, can manipulate these magnetic fields to float through the air in the caverns. Adehiiri does have a space port though and it IS possible to live there as a troll, provided you have a way to get around!