Oniontchi looks like an onion. Besides that, he has a yellow beak, light brown cheeks, stick legs, and his eyes always look a bit angry.
The American Tamatown V4 says, "Oniontchi is very stubborn, but very lovable. He tends to make mistakes easily and cries out loud when he's made big ones!"
While an average Tamagotchi, he is also known to be a very bad singer. Usually it can be found singing loudly in it's bedroom. He is in the middle of a rebellious age and tries to put on a strong front; although it is really a crybaby type. It seems bad, but is really a nice guy.
On Virtual Pets
Oniontchi is a teen obtainable in even-generations with two or more care mistakes. It always evolves from Marutchi, as only Kinakomotchi can evolve into Young Mimitchi. However, a Kinakomotchi with two or more care mistakes can evolve into Oniontchi. It sleeps at 9 P.M. and wakes up at 10 A.M.
Tamagotchi Connection Version 2
Oniontchi is one of the two teens obtainable on an odd-numbered generation from bad care. Its favorite food is french fries, and it dislikes parfait. Oniontchi sleeps from 9 PM to 10 AM.
Tamagotchi Connection Version 4
He is one of two male teen-stage Tamagotchis in the Kuchi family. Oniontchi is the worse care teen, the other better care teen is Young Kuchipatchi. He can evolve into Minotchi with high intelligence points, Tarakotchi with high style/fashion points, or Kuchipatchi with high social/kindness points. If he evolves into a Kuchipatchi and then obtained 350+ social/kindness points with 450+ total points, Kuchipatchi can evolve into a Nonbiritchi.
Chou Jinsei Enjoi Tamagotchi Plus
On the Entama, Oniontchi is very similar to how he was on the V4. He is the worse care Tamagotchi in the male teen-stage Kuchi group, and he evolves into Minotchi with high intelligence points, Tarakotchi with high style/fashion points, or Kuchipatchi with high social/kindness points. With 350+ social/kindness points and 450+ points total, Kuchipatchi can evolve into Nonbiritchi.
Oniontchi's name comes from the English word "onion", which is what it is he is based on.