The Green Lights Colony — a group of cats who live in a mountainous area. They worship and believe in the entity known as Ion. The cats of Green Lights Colony tend to wear leaves on their fur to represent their group and their love for nature and of course, Ion. They treat will seriously and view quitting as a great weakness. They always use the prefix Green in their names (ex. Greenspark, Greenheart, Greenfang) and are also known to have friendships with non-cats such as dogs, raccoons, ravens, etc.
The Amazons — a group of cats consisting of only she-cats. None of the toms are allowed to stay past kittenhood (They're basically like The Sisters, from the actual Warrior Cats series). Some cats who are in their group may have the ability to see and speak with their ancestors. The cats in this group are powerful fighters, and they're usually larger and stronger than the average cat. Their camp resides on a small island, which they call Themyscira.
Atlantis Kingdom — a group of cats who live by the ocean, most notably inside a spacious cove. They live as a monarchy, being ruled by a king and queen. They are excellent swimmers and have the ability to remain underwater for quite some time, due to their ancestors who have evolved to withstand and tolerate their environment.
BatClan — an unofficial clan of cats who have an association with Batglare. As Batglare's family grew bigger, his first adoptive son, Nightwing, had suggested they put a title to their family, and thus the name BatClan was chosen (note: Batglare and the rest of the batfam are on-and-off members of JusticeClan, like Aquashine and Greenspark are. They're basically half loners). BatClan cats are sneaky and have excellent night vision. Their camp is inside a dark cave near twoleg place.
JusticeClan — a group of cats who live deep in the woods. Founded by Superstar, Batglare, Wonderstrike, Mimicstalk, Runningheart, Greenspark, and Aquashine—the cats had created the clan during a time when twolegs were invading the forest and were destroying wildlife. JusticeClan are a mainly peaceful clan who are known to take in outsider cats who are in need of help and/or shelter. The cats of JusticeClan are powerful, courageous, and not afraid to take risks—they are the only known cats who are brave enough to fight twolegs and bears. JusticeClan are greatly respected by other groups, but their notoriety also draws in bad apples who want to get rid of them.
some brief info on the groups! there's a chance something will change in the future. there's like a lot of groups/communities in the DC universe but I don't want to include all of them since that'd be quite a hassle. In the Warriors books there's currently five clans (at least officially?) so I'm choosing to follow that limit. BatClan doesn't count obv