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, slighly 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.
He's a very high strung person who takes everything seriously, often too much so. As cruel as Peter White when dealing with others, whether they be subordinates or enemies, he is not above shooting a person simply because they did not do their job correctly or they said something he didn't approve of. A hard worker, Sidney pushes his subordinates to work almost as hard as him, yet he'll also force them to take breaks so that they don't work themselves too hard. He's the sort to yell and insult a person when he's worried about them and will demonstrate concern over the smallest things. Sidney accurately falls under the category of "tsundere," as he is harsh and downright rude most of the time yet being gentle and affectionate when he feels the need.
Unlike the White Rabbit, Sidney doesn't have a hatred of germs, as shown by such incidents as his brushing sweat from Alice's forehead and eating a bite of cake off of her fork. He claims that he hates Peter White above all other people and is incredibly competitive of him, to the point where he will do something simply because Peter did it.
He came from a family of black rabbits, but, due to his red eye, they abandoned him, because his nearly blind red eyes was a deformity and a weakness. Crysta accepted him when his family left him and took him in, both because she wants him as part of her collection and because she loves rabbits. As he has two different colored eyes, he is unique, and Crysta wants him in her collection of frozen things for this reason.
His insistence that he truly was a black rabbit and that he wasn't "nothing" lead him to make a deal with Joker, and his hatred of the White Rabbit is because of, or at least includes, Peter's apparent lack of emotions, while Sidney himself feels strong emotions.
Diamond no Kuni no Alice
Sidney appears when Alice appears in the diamond castle. She makes a bad impression by comparing him to Peter.
Diamond no Kuni no Alice ~Wonderful MIRROR World~
- Alice in the Country of Diamonds Fanbook
- Sidney is skilled at baking. (spoiler) In the epilogue of his Best End, he promises to bake a chocolate cake for Alice.
- Having been unloved, Sidney finds it difficult to understand love and to believe when others love him.
- Because he has simple heterochromia iridum, Sidney is nearly blind in his red right eye. His monocle has hardly an effect on his eyesight, as the color of his eye is because of a lack of melanin (the same reason that albinos have red eyes and no coloring in their hair or skin).
- His tendency to push himself so hard at work is due to his need to be of worth.
- Sidney is the first character shown to have made a deal with the Joker who became "his Joker."
- "I will dye you purest black. You shan't be black simply on the surface- I'll make sure you're corroded through and through, never to return to white again." - Black or Sweets
- "How irritating, that the White Rabbit uses your name so readily... All right, I understand. Henceforth I shall refer to you by your name. Alice Liddell, Alice Liddell, Alice Liddell..." - Black or Sweets