Star Clan actually has some sort of a class system,but it more so depends on your rank before death if you were a clan cat or your age if you aren't. It can also be based off how good of a person you were.

The first rank is T,or Tiny.

These were the newborns and only day old Kittens who died,or the cats who just managed to squeeze into Star Clan.

Then we have L,for little.

For the little kids,kittens,Kittens, Puppies,and those who did a little amount of good.

Then we have M,for Medium.
The apprentices and freshly appointed warriors are at this rank. Most non clan members are at this rank.

Then there's K,or Kingly.
The Warriors,Most leaders,and Deputies are at this rank.

Then we have G,Gifted.
Medicine Cats,their apprentices,and some leaders sit at this level. Queens (pregnant/nursing females) also stand at this level.

Then F,Federal.
A select few leaders,the subjects of great prophecies,and most human members of Star Clan stand at this rank.

Then we have A,Ancient.
As the title suggests,the Ancients,Elders of every living rank (like senior warriors),and those of extreme importance are here. The first leaders of each of the clans are also here.

And then O,Omnipresent.
The leader of Star Clan is the only one with this rank.

The ranks don't define what you can do,but it does define how much power you can exert in the living world.

T ranks can barely influence the living world,A ranks have full control over certain aspects,and the O rank has full control over basically everything nature related.

This is based off how real stars a classified,so this wasn't just random letters.