Tonmarutchi resembles a round, green ball with eyes, a mouth, and a large point on the top of its head.
Tonmarutchi likes to mess up its hair. Supplemental art depicts Tonmarutchi hiding in a cardboard box when it gets nervous.
As stated by the Nintendo Power Tamagotchi Gameboy guide: "Tonmarutchi may look like Marutchi, but it's much grumpier than its cheerful cousin. It's a nervous sort, and likes to hide in small or narrow spaces."
On Virtual Pets
Tamagotchi (Generation 2)
Tonmarutchi evolves from Shirobabytchi after 65 minutes, and will evolve to the teen stage after 48 hours. It can become either Tongaritchi with good care, or Hashitamatchi with poor care. It wakes at 9 AM, sleeps at 8 PM, and has a base weight of 10. From this stage onward, it becomes vulnerable to Death from neglect.
While Discipline doesn't affect which teen it evolves into, it affects what amount of Discipline the teen starts off with, and therefore what evolutions are available to it. If the meter is 75-100% full, the teen will begin with 50%. If the meter is 50% or less, the teen will begin with 0%.
In Video Games
Tonmarutchi is the unhealthy child, evolving from Babytchi and Shirobabytchi with ten or more stress. If its stress is under ten, it will evolve into Tamatchi with zero selfishness or Tongaritchi with one or two selfishness, and if its stress is ten or higher it will evolve into Kuchitamatchi with less than two selfishness or Hashitamatchi with two selfishness.
Hoshi de Hakken!! Tamagotchi
Tonmarutchi is the sole child stage character of the Group F line. It always evolves from Shirobabytchi, and will evolve into Tongaritchi with good care or Hashitamatchi with bad care.
- It is possible that Tonmarutchi was going to be featured on the Tamagotchi Connection Version 1, but was replaced by Kinakomotchi, since Tonmarutchi and Kinakomotchi look similar, are the two child characters, and Tonmarutchi only appears on the Generation 2 Tamagotchi.
"Ton" is short for "Tongari", which means a pointy hat, or a sharp point. This refers to the mound on top of its head. "Maru" means round, relating to his round body. Tonmarutchi may also come from Marutchi's name, having "Ton" added to Marutchi as a prefix.