Little is known for sure about Tsukiyo. Even her real name is unclear. She's young, around ten or twelve maybe. Her most striking features are the tattoos across her skin. It's not clear when or how she got them, exactly, as her story has holes, but they do exist, despite all questions. The flame tattoos travel up her forearms and her calves and around her eyes. Her hair has been dyed to have the appearance of flames. She has green eyes and a high-pitched, excited voice. Normally, she wears black cargo pants with a flame design on the cuffs with yellow pockets and a purple shirt with a fire on it that says "NIKO."

Much of what is known about Tsukiyo is known through Dr. Dowasure. Throughout her life Tsukiyo was always a rambunctious, energetic, and easily distractable. She was hard to control and harder to keep track of. She jumped from one thing to the next, was unpredictably violent with others, and was greatly enthused by just being alive in general. In short, she was your typical energetic child.

Tsukiyo's family detail are still fuzzy. She has a role model in a friend of the family, a young man named GK. She looked up to him with a fervent kind of hero worship, and trusted GK to be able to do anything.

At some point in her life, Tsukiyo heard a song called Night of Fire. Tsukiyo had long been a pyromaniac, something which worried her parents to no end, and she often burnt small pieces of paper around the house when she didn't think anyone was watching. Several times she almost started a serious fire in one way or another, and since she would just laugh afterwards, it was hard to say whether or not it was intentional. One way to calm her down if she was truly uncontrollable was to light a candle. Tsukiyo would be transfixed by the flames for hours.

Tsukiyo's love affair with fire was not triggered by Night of Fire, but the song did something to her understanding of herself and her obsession. The song kicked her mind into something that no one else would really be able to understand. Fascinated, completely enraptured with the song, Tsukiyo looked up every scrap of information she could find on it. In the process, Tsukiyo found a Japanese to English dictionary and, liking the sound of the language, set to memorizing words from it. Tsukiyo has never taken any serious Japanese classes and therefore, her understanding of Japanese grammar and sentence construction is laughably bad. However, her vocabulary is fairly varied, although she doesn't understand the context and meaning behind the words that she chooses. She strings words that she knows together almost at random.

When she heard Night of Fire, this was when she began to phase out speaking normal English altogether. No one is quite sure why she did this, or why Night of Fire triggered this behavior. Some who interviewed her believed that this had a deeper source than the song, but her parents never saw any indication for this kind of thing before she heard the song.

Something about Night of Fire did something to Tsukiyo. That was when she rechristened herself to Tsukiyo no Kaji, or as her Japanese dictionary told her, Night of Fire in Japanese. Enraptured with the idea of fire, of flames, of burning strong and devouring anything and everything in her path, Tsukiyo became obsessed with becoming fire. When her parents refused to call her by her new name, Tsukiyo added a new confusing change to her behavior. Now, she not only responded to questions with random Japanese, but with song lyrics. This baffled and irritated her teachers and her friends at school, who swiftly lost interest in her. Tsukiyo at this point did not care in the least. She had her goal and frankly, she didn't care if anyone else approved of it or not.

Tsukiyo went to GK to ask for help to become fire. GK, who knew and apparently understood what Tsukiyo was trying to do, decided to help her out. He's responsible for Tsukiyo's hair and her tattoos, although exactly how GK managed to get a girl so young tattooed so extensively was something never solved. GK has connections, but it still rises strange questions.

Tsukiyo came home, proud and vibrant, and her parents about had a heart attack. They banned GK from the house permanently, and this was something that happened that finally affected Tsukiyo. Tsukiyo's behavior and decisions had been so completely outside other interactions for so long. GK being banned from her house hit her hard.

At this point, Tsukiyo set her house on fire. It's assumed because she was upset about GK leaving by some, and because she was a raving pyromanic by others.

As a result, Tsukiyo was committed to the same mental hospital that Dowasure was in, and that was how the two met. Tsukiyo immediately took to Dowasure and viewed him as a brother of sorts. She felt intensely protective towards him, and while she can't say as such unless it was through a song of some kind, she tried to make it clear to him.

Tsukiyo first saw Gekkani across the room sitting by himself. Seeing the markings on his skin, Tsukiyo flipped through her mental dictionary and gave him his name, Gekkani no Kumori. Like Dowasure, she grew instantly attached to him.

Tsukiyo's insane energy, her constant love for life, was inspiring but difficult. To her friends, Tsukiyo was constantly the life of...everything, really. She made everything seem real. To everyone else, she was fairly psychotic. In the end, who can say? Tsukiyo functioned on a separate reality than everyone else, that was for sure.

Tsukiyo was taken away from Dowasure's room one night. No one knows what happened to her. She may still be alive somewhere, but no one can say for sure.

Tsukiyo is a bright, energetic, loud, and vivacious person. She's constantly talking, moving, dancing, or singing. She has no idea that her Japanese is horrible, but she more often leans towards song lyrics to express herself anyway. She can find lyrics for almost any occasion. The easiest way to get her attention is with fire or with a song.

Tsukiyo adores and loves fire. She loves setting fires. She loves watching things burn. She feels no regret for destroying something (or someone, it may go) through fire. While Tsukiyo has the ability to be very compassionate, loyal, and protective, it's on an extremely selective and apparently arbitrary basis. Those she doesn't care about often slip completely under her radar, almost as if they don't exist as all except as an audience. She absolutely loves all kinds of attention and, if she's being ignored, she'll go to further and further heights to get some.

Tsukiyo is in Strands.