| "How Small."|
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|Japanese Name:||小山田 圭子|
|Romanized Name:||Oyamada Keiko|
|English Name:||Keiko Oyamada|
|First Appearance:||Chapter 47 (Manga)|
In contrast with the rest of the family, she is of an average height and slender build, with neck-length black hair.
From her son Manta's own opinions, Keiko is apparently a very shallow and superficial person. She told her son not to be friends with Asakura Yoh anymore because how it would look for a member of the family to be seen with a spiritualist.
Shaman Fights in Tokyo
After her son was injured by the shaman Johann Faust VIII she visited him in the hospital. There she tried to convince him not to see Asakura Yoh anymore, motivated mostly by her concern of how others would perceive Manta's association with a "spiritualist" rather than out of concern for her son's safety. Manta chastises his mother's superficial attitude and runs away leaving her standing in the hospital with his younger sister.
Oyamada Keiko is a manga only character and never appears in the anime.