Half-youkai

'Half-youkai' (Japanese: 半妖怪, Hepburn: 'Han-yōkai') is a term given to humanoids if one of their parents is a youkai-born and the other is a humanoid. In The Drillimation Series, it is the most common type of humanoid.

Notable half-youkai

Normal inheritance

Person	Humanoid Parent	Youkai-born Parent
Konata Izumi	Soujirou Izumi	Kanata Izumi (neé likely Kobayakawa)
Hiroki Takajima	Hiroshi Takajima	Miyuki Takajima (neé unknown)
Susumu Takajima
Keishi Yamauchi	Kenjirou Yamauchi	Ayano Fuchigami
Reina Yamauchi
Shinji Yamauchi

Half-youkai and muggle inheritance

Person	Humanoid Parent	Half-youkai Parent
Kumiko Uchida	Hikari Uchida (née unknown)	Tomohiro Uchida

Half-youkai and youkai-born inheritance

Person	Youkai-born Parent	Half-youkai Parent
Minoru Takajima	Kagami Ochiai	Susumu Takajima
Konata Takajima
Satoru Takajima