It's sometimes different for every household.
Here are dominant cat is Loki. But you might not realize it. Cupid can be the one that picks on the others from time to time. Loki, he's more laid back and just chills. But, NO one ever messes with him! even when all the kitties are play wrestling, etc. everyone knows not to jump on Loki...if Loki wants to play, he'll tell them. He rarely gets to the highest point, but when HE wants a spot, the others move. He doesn't rule with an iron paw, but he does have a lot of respect and when they others get out of line too much he can put them in their place, quick! hehe
There's not a lot of power struggle here, so it's pretty calm...Loki's in charge and everyone's fine with that hehe