Keiko Yoshii

Lain's homeroom teacher, is a minor character who appears in episode 1 and episode 8. She has very few lines.

Keiko Yoshii
Information
Gender	Female
Age
Family
Occupation	Teacher
Affiliation	Ouka Private Girls' Academy
NAVI
Debut	Layer 01
Featured in	Anime
Location	Ouka Private Girls' Academy
Voice Actor(s)

Her name, Yoshii Keiko (吉井恵子), is only known because it appears in the credits.

Serial Experiments Lain @wiki mentions her on this page (Japanese).

Characters of the Serial Experiments Lain Anime [ × ]

Iwakura Family

Lain Iwakura • Miho Iwakura • Mika Iwakura • Yasuo Iwakura

School

Juri Katou • Alice Mizuki • Reika Yamamoto • Chisa Yomoda • Alice's Teacher • Lain's Teacher

Cyberia

JJ • Masayuki • Myu-Myu • Taro

Knights of the Eastern Calculus

Shoko Masatsugu • Masuoka Takuyoshi • Freeter

Conspiracy

Masami Eiri • Men in Black

Other

Cheshire Cat • Professor Hodgeson • Shou Masatsugu • Nezumi • S • Deus