Minion kittens. When an evil being or entity gathers to them
dark forces to do their evil
bidding, and all they can get are kittens, they've got
mittens.
Also; cats who follow their person around everywhere, as though they intend to be helpful, but really just want to sleep near them.
Sorcerer: "Go, my Mittens, and bring me
the Dark Crystal of Power!"
or
Lady: I wanted to go get another cup of coffee, but
the mittens will just follow me and meow constantly.