- 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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