There are 59 cats, 21 are considered rare. (as of May 2017).
Billy the Kitten and Mr. Meowgi have the highest power level (power level: 250) in Neko Atsume.
Mack is described as "determined" in Neko Atsume.
The literal translation of Neko Atsume from Japanese is 'cat collected'.
A game similar to Neko Atsume where you collect dogs instead is Boku to Wanko.
In Neko Atsume, mementos are special items that cats leave behind after visiting your yard. To receive mementos, you need to attract rare cats by placing specific food or goodies in your yard. Each rare cat has a unique memento associated with it, which you can collect after the cat visits. Once the cat leaves, check your inventory for the memento they may have left behind.
Shadow is described as "peculiar".
Marshmallow is descried as "aloof".
Cocoa is described as "indecisive".
Willie is described as "crafty".
Tabitha is described as "leisurely".
Gabriel is described as "diligent".
Patches is described as "jealous".