Made Eye Deal With
Kazuki Yao (矢尾 一樹, Yao Kazuki)
Jilu Cao (曹冀魯, Cao Jilu)
Sidoh (シドウ, Shidō) is the Shinigami whose Death Note is stolen by Ryuk. By the time he realizes this, however, the note has already changed hands several times, ending up in the hands of Mello's gang (more specifically, Mello's subordinate, Jack Neylon).
He wears heavy clothing that obscures most of his features, and his head is wrapped in bandages. Obata states that Sidoh's "arms" can be described as insect-like in the way they fold into his body. Though he has "hands", there are only three fingers on each appendage. In the video game, parts of him are brown and red while his bandages are a much brighter white.
Sidoh has a great liking for chocolate, just like Ryuk does for apples, something he shares in common with Mello. Sidoh is fairly timid, being intimidated by Mello despite the fact that Mello is a human.
After repeatedly hounding Ryuk for its return (which also involved him passing out flyers to other shinigami in the vain hope that they might recover it for him), he tracks down the Mafia to get his Death Note back. In order to regain his Death Note, Sidoh agrees to help Mello's gang against Near's SPK and the Japanese Task Force. After Light regains the Death Note from Mello, he reluctantly returns it to Sidoh to keep him from interfering and as a way of trying to get the task force to trust him.
Tsugumi Ohba said that he used Sidoh as another Shinigami appearing in the human world because he liked Sidoh's appearance; Ohba described Daril Ghiroza as a "candidate" and that he wanted a "pretty pathetic" character.
Obata described Sidoh as "very funny," citing the time when Sidoh becomes the first Shinigami to distribute flyers. Obata said he wished that Sidoh appeared more often in the story.
Obata said that when he discovered that another Shinigami would appear on Earth, he filed through designs and nominated Sidoh and Daril Ghiroza. Obata said that he believed that Ghiroza would be chosen and prepared for that decision; instead Ohba selected Sidoh. Obata said that he based Sidoh's design on the appearance of a bird with his mouth being based on a beak of a canary. Obata described Sidoh's foldable arms as more "insect-like".