Throwing my otherworldly DCAs into a pile. Watching them interact like Finn in that one Adventure Time episode.
Space Dummy's Guide trio would be awestruck by One Lost Star's trio, though they'd definitely be the first group to make friends with each other, alongside Cosmic Journeys Sun and Moon, Along the Akesh Sun, and Come and Go Sun.
Suun and Moonthra would warm to the Suns and Moons, and probably Space Dummy Eclipse, but they'd have some complicated feelings towards One Lost Star Eclipse and Cosmic Journeys Eclipse. The Eclipses have an equally complicated dynamic, ha. They'd find it the easiest to understand each other and get along (though SDG Eclipse would be a bit of an outlier, that's alright, Along the Akesh Moon is there to fill the void XD).
Come and Go Moon and Burning Stars Eclipse would be completely and utterly put off by each other, considering their relationships with their opposing canon siblings, but ironically are the ones best suited to help each other heal in their losses and betrayals (and probably also Suun and Moonthra, it is an awkward "we got betrayed by/failed our loved one(s)" therapy circle. OLS Eclipse would be here, but...it's not quite the same, plus he's already gone through his Y/N therapy lol. Between the Particles Eclipse, on the other hand...).
On the flip side, Ecliptis, Titan, Burning Stars Moon, and Come and Go Eclipse all hate each other with a passion. But with their keen eye for strategy, chaos, and suffering (not to mention insanity), Titan, BS Moon, and CaG Eclipse would at least tolerate each other's company, if for nothing more than their own personal gain. Ecliptis is too busy getting into a fistfight with OLS Eclipse to notice the much punier villains. Surprisingly, Ecliptis might hold the tiniest inkling of respect for Cosmic Journeys Eclipse, or he's at least wary of him. Don't fuck with the fae king, even if you're the lich king.
As for the Lords...Ha. Everyone would be fucking terrified of them. Those motherfuckers can get so big they can use galaxies to play hopscotch. Lord Moon makes Ecliptis look like a bitch. The Lords might find some amusement with a few of them, though. Depends on their mood and the person.
Not forgetting Eclasis-Penma (Skyrim au Eclipse, the only one of the trio that could be considered otherworldly), he just would refuse to interact with anyone outside of observing, trying to pry free crucial bits of information, or fucking with them (he would be such a dick to the SDG boys). Then there's also Along the Akesh Eclipse, whom is a bit of a strange one to place as the combo of AtA Sun/Moon, but for shits and giggles let's say he's just there trying to have fun and not blow anything up or think about the horrors (he'd def be part of the Eclipse group).