Sidney Black

Sidney Black is the Black Rabbit and the Prime Minister of the Castle of Diamond. Unlike Peter, he hates Alice. He is high-strung and gets irritated very easily. He hates the colour white and wants to paint everything black. This means that he hates the Queen of Diamond's love of white but he is still her faithful subordinate. He's very worried that all the stress will give him grey (in Japanese, white) hairs.

Like Peter White has white hair, Sidney Black has short black hair. He has heterochromia iridum, with one red eye, covered by a monocle and a black, slightly grey eye. He appears to be a lop ear rabbit, since his ears are always down compared to the other rabbits in the game. He wears a small top hat with the same flower on his chest. He also has one glass lens for his red eye only. The outfit he is usually seen wearing—a white tuxedo shirt under a yellow, pink, and black vest with a large pink bow in the back, black shorts, and long black boots—is of Crysta's choosing. He has been shown wearing much more relaxed and all black clothes when younger. His personal style is probably a lot simpler, in Alice's opinion.