Mini/Black Butler

Misspellings in Black Butler create Continuity Cats.

Canon Origin
One of the show's (many) running gags is the character Sebastian's over-the-top love of cats. (The manga implies that the closest thing to pets where he's from are xenomorphs from the Alien films. Yes, really.) As seen in the picture, his favorite is a long-haired black stray hanging around Phantomhive Manor.

Continuity Cats are duplicates of said stray who all appear about a year old. They mimic some physical aspect of their namesakes, usually eye color, but do not appear to share personality traits. Continuity Cats are also protective of their namesakes, and will attack mini-Sues as well as actual Sues.

Character Minis

 * Ciel POV
 * Bardroy
 * Mey Rin (preemptively adopted by Matt Cipher)
 * Ceil