Hijiri Seki

Hijiri Seki is the name Azuma's bird, Bunchou-chan, took on after his rebirth within Wonderland. Having been brought to Wonderland as a corpse within Azuma's pocket, he was partially brought back to life as a grotesque mixture of bird and human by the sheer power of her will being poured into her manifestation abilities. Afterwards, the Cheshire Devils that encountered his half formed body decided to give him the cubed essence of a human soul. This enabled him to fully transform into something resembling a human in order to protect Azuma. Azuma is reminded of a bird upon looking at him, but it is some time before she makes the connection that her pet bird is the person protecting her in Wonderland.

As a human
Seki is tall and thin, with long shaggy brown hair. His appearance is generally unassuming, but he is capable of intense expressions of rage.

As Bunchou-chan
As a bird, Seki is a fairly normal budgie. After death one of his wings is removed.

Epilogue
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Personality
Seki is a generally disagreeable person, as he has little interest in forging relationships with other people. Even so, he is clever and quick witted, making him a valuable member of the team.

When it comes to Azuma, however, Seki is extremely devoted. She was his owner and caretaker and genuinely loved him as a bird, so in human form he still sees her as his "owner" and loves her very much. He turns violent towards anyone who would threaten her, puts himself in the line of danger for her, and attempts to stop her from endangering herself, although nothing can stop Azuma when she's on a rampage. At one point he protects her by materializing an egg around the two of them and holding her while she regenerates.

Seki is the happiest when Azuma is happy. He will follow her anywhere and uphold any decision of hers that does not involve putting herself in danger. Who she loves, he loves, and who she hates, he has been known to beat to a pulp. Functionally he is Azuma's protector, and thanks to him she is able to make decisions for herself, as he will defend them and her right to make them. He is a very good bird.

Trivia

 * The translation of his description while in the form of Bunchou-chan incorrectly states his age at death to be three days. In truth, he is three months old - the story takes place in June. Additionally, three day old birds do not look like Bunchou-chan did.
 * Azuma refers to him as Bunchou-chan because she mistakes him for a different bird species. He corrects her on this.
 * His name - Seki - comes from Sekisei Inko, the Japanese term for a budgie.