Charlotte

Japanese	お菓子の魔女の手下。その役割はチーズを探すこと。; しかし過度な期待は禁物。
English	Minion of the witch of desserts. Its role is to find cheese. However, don't expect too much from it.

Japanese	お菓子の魔女。その性質は執着。欲しいものは全部。絶対に諦めない。お菓子を無限に生み出せるが大好物のチーズだけは自分で作ることができない。チーズさえ持っていれば簡単に隙をつくことが出来ただろう。
English	The witch of desserts. Her nature is tenacity. What she desires is everything. She will never give up. Though she is capable of creating infinite amounts of any dessert she desires, she is unable to make the cheese that she loves most. If you have a piece of cheese, you can easily catch her off-guard.

Charlotte's first card from official website.

Charlotte's second card from official website.

Charlotte (CHARLOTTE) is a witch appearing in Episode 3 of the anime.

Charlotte as she first appeared.
One can see a bomb stuck to Charlotte's tongue, which she then swallows. This and other bombs Homura laid down during her game of leapfrog made the series of explosions which killed Charlotte.
Charlotte's grief seed.

Minions

Pyotr's card from official website.

A charlotte is a type of dessert.
The head of her first form is shaped like piece of candy in wrap.
Watching carefully one can see that when Charlotte's second form gets injured a new Charlotte comes out of the mouth replacing the old as if the layers are being blown away.
Her second form may have been inspired by The Very Hungry Caterpillar.
It is possible that she was designed around the theme of bulimia nervosa, which involves restrained food intake, periodic binge-eating, and frequently the purging of consumed foods through vomit. Issues of self-image may be involved.