- Official name：土間大平
- English name：Taihei Doma
- Chinese name：土间大平
- Other names：土间タイヘイ / どま たいへい
- Gender：Male
- Birthdate：Jun 2
- Height：170cm
- Bloodtype：A
『Taihei Doma』
Age: 26
Occupation: Systems Support Worker
Taihei Doma is Umaru's older brother; he has an office job and also does the cooking and cleaning at his apartment which he shares with Umaru. He is also a perfect student (in his past) and the top of the top of onii-chan.
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