the one with the collars are the people who have the most anima as helpers or slaves. they are mostly the ones who sell them or keep them for themselfs. They are usually princes, kings, queens or princess. Anima also have the ablity of that one certain animal. Like for fish you can breath underwater for a very long time. But if you like that anima and act that way forever you will become that animal and never able to turn back.Also one more thing they always have a symbol on them represting what anima animal they have. Here are my charaters and the main charaters of that manga.
Main charaters

My charaters sad only have one anyway lols)
name: Alice Swift
age: 16
+anima animal: Mocking bird
role: entertamenet for a pervert, crazy prince.
personality: lonely
likes: being free
hates: being trapped and master.
looks:

bio: Was a slave for entertament once she found out her animal. She always had to stay in her room which was a huge cage with a small bed in it. She always had to sing luring other anima to where her where abouts are to death.
She hated it all . she didnt want any of her kind to die or be a slave. She wished she can escaped but everytime she failded trying.
anima animal symbol sad located on left ankle.):

