I would argue that although larger forces in the Delta quadrant can’t really be compared to the Federation due to how ideologically different they are, alliances and systems similar to how the Federation operates do exist. For example, the Kyrians and Vaskans. It could easily be argued that they had a similar ideology and philosophy to the Federation, perhaps even trying to copy its system (due to Voyager’s doctor telling them about it?), and just operated on a smaller scale than the Federation itself.
Criteria matches up pretty well:
Territory: Considering they have access to technology such as starships and holodecks, I’d say that they have gained control of a system or two, or at the very least, have the ability to.
Peoples and Cultures: Considering both species are unique and live peacefully with each other, I would say they aren’t very xenophobic. Combine that with the fact that they let a hologram with the appearance of a human become a medical leader in their world.
Peaceful or Not: From what they’ve seen, 700 years later after the “Voyager incident”, they seem to be pretty peaceful after the true details of Voyager were found. I hate to bring up the point about Voyager’s doctor becoming a medical leader on their home world again, but if he was willing to stay on their planet for a long time, they couldn’t have been all that violent, could they?
Powerful or Not: Again, they had starships and directed energy weapons, so they must’ve been able to defend themselves quite well.