Mittens will always exist in our hearts, which may require a trip to the doctor.
Mittens is gone.
Mittens even had her own Wikipedia page!
Also. May I propose that in memory of this heroic feline, FIDE upgrade her rating to 2 and award her the posthumous title of “grandmaster”?

At Mitten's Graveyard:
Chess.com members: "WE MISS YOU MITTENS"
*horrific band song plays in a coffin*
Chess.com members: "Is that... MITTENS?"
*members find the coffin and see an entire band of "miniature" mittens playing haunting songs*
*they emerge into mittens*
Mittens: "ENOUGH! I'VE HAD IT WITH YOU ALL! NOW, SAY HELLO TO MY FRIENDS READY TO TORTURE YOU!"
*30 minutes later...*
Mittens: "Behead him!"
Me: NOOOO!
*I realize that this is a dream, soaked with sweat, and woke up.*
*LOOKS OUT THE WINDOW FINDS A LARGE MOVING CAT PLAYING THE VIOLIN AND CHESS KINGS BOWING TO MITTENS SAYING "LORD, LORD!"
Me: Mittens...?
All chess players chant "Mittens, Mittens!"
Mittens: "WHY DO I HEAR PEOPLE CHANTING MY NAME?"
Mittens: "Every single one of you who chanted my name will go under my paw!"

Mittens was such a troll lol it’s fun when companies do this and helps connect and let’s people enjoy more of the site.

Also why does half of the chess community have a mittens profile picture?
Lack of creativity or things of personal meaningfulness in their lives. The same reason why everyone about 15-20 years ago was getting those horrible "tribal" arm tattoos, or a sun disk around he navel or the biohazard symbol...These aren't personal or meaningful. They're trite and only show that this person is just like everyone else.
Now mittens will only exist in the winter.