TetoRitsu

Tetsu is the non-binary ship between Kasane Teto and Namine Ritsu from the Utau fandom.

Canon
Teto and Ritsu are both characters from the music software Utau. They also have in common that both are Vipperloids, which are Utaus created by trolls in the japanese page Vip@2ch. Their purpose was to deceive people making them thing that they were new Vocaloid characters, and in Teto's case, she was created as an April Fool's joke. Teto and Ritsu have a bit of characteritation, but since they were created by different people, they don't have any official relationship or dinamic. Their dinamic depends on the song that they sing together.

Songs
Teto and Ritsu are a very used combination and there are a lot of covers of them of different Vocaloid songs. Even so, their amount of original songs is scarse, as there aren't many popular Utau songs in general. Their most popular original song is Flame Heart by Death Ohagi, that talks about Teto and Ritsu's passionate feelings. Respect their romantic songs, the album OverDance include a few of them, like Dramatica by Nagekino-P, that talks about an unrequited love between them and how they fall in love while dancing. Other romantic songs include Kaleido (also by Nagekino-P) and Moonlight Waltz (by Toka Minatsuki, that also apperaed in OverDance).

Fanon
Being the two most popular Utaus and also Vipperloids, Teto and Ritsu are a very popular duo and many covers and fanarts of the two of them have been made together. Even so, Teto and Ritsu are only popular as an duo, and as a ship it is purely a rarepair. The ship itself is very overshadowed by ships like Ruketo (Teto x Ruko), Ritsuko (Ritsu x Ruko) and Listu (Ritsu x Lily), and most of people prefer to ship them platonically. There are no works of this ship in AO3, but there are around 3 romantic works of them on Fanfiction.net. The ship have been portayed as het and femslash, although the ship tends to by more seen as het.

Controversy
Teto and Ritsu were both created by trolls, and they have very unrealistic profiles that normally aren't taken seriously. Canonicaly, Ritsu is 6 years old and Teto is 31. This fact obviously made the ship receive a lot backlash, even though there are ships like Ruketo and Listu that have similar problems and don't get many critics. Since they are joke characters, many people things that it is okay to ignore their ages and give them the ages that you want, so it is okay to ship them. Even so, it is still one of the least popular ships for both characters.

Fandom
FAN FICTION
 * Teto & Ritsu tag on Fanfiction.net

Trivia

 * Kikunoji (菊の字), and official Ritsu ilustrator, made arts of the two together.
 * TetoRitsu's day is October 11, that is found between October 10 (Teto's day) and October 12 (Ritsu's anniversary).
 * Both Teto and Ritsu came to have voicebanks of other synthesizers. Ritsu got a DeepVocal voicebank on October 9, 2019, while Teto will get Synthesizer AI voicebank in 27 April, 2023.

Variations

 * Tetsuko refers to the ship between Yokune Ruko, Teto and Ritsu
 * Vipperloids refers to the ship between Kasane Ted, Yokune Ruko, Rook, Ouka Miko, Sukone Tei, Teto and Ritsu