Interesting idea, I could add a lot of them but I'm not sure the format works well for all entities I know. I'll start with something simple.
Name of entity: Catgirl
Threat Level 5-8/10
Entity type: Yokai, feline, anthropomorphic
Single Entity: No
Habitat: Forest areas, cities
Intelligence level: Conversational, above average occult skills.
Organizations: Part of the old egyptian pantheon.
Typical Personality: Catlike.
Appearance: Female anthropomorphic cat, can change their form into that of a complete animal.
Summoning methods: Use attached sigil, or contact Bastet and ask her for one. May often come out of their own will, so summoning is usually redundant.
Special notes: Different types exist. Direct minions of Bastet are elites with sharp occult knowledge, appear taller than other catgirls. Wildcats are nomads who may come to you at will, and stay or go as they like. Mate-seeking catgirls are actively looking for a master and will carry a necklace and a bracelet. If they find the person they like, they will ask you to put the necklace on them and the bracelet on yourself to complete the "ownership" ritual. This is not a slave relation or soul ownership, but should be viewed more as a marriage.
A different kind of catgirl also exist in asia, appear wearing traditional clothes such as yukata. They have their own paradise world which may allow visitors under certain conditions.