Ayako Kawasumi (Japanese)
Patricia Ja Lee (English)
Mika is the older sister of Lain. At first, she doesn't seem to mind her family away from home and spends all day talking with them. After a while she seems to care and show more interest and became obsessed, leading to her downfall of later on losing her sanity.
She is a sixteen year old student usually seen with her brown hair worn down outside the school and at home. Mika is occasionally seen wearing her school uniform and other various casual clothes, but never adorns herself with anything too out of the normal, leaving her appearance rather fitting and common.
She is a normal girl who likes hanging out with her friends, just like any other girl would her age. During the course of the show, she slowly notices that her little sister is obsessed with computers to a point where it frightens her. This shock wasn't just because of how talented she was with them, but that she could do so much as that she could even hack nearly anything related to computers, technology, and electricity. After this, a few obscure events happened such as when she mysteriously got locked in a bathroom with light off and written many times on the door "fulfills the prophecy", which ended up ruining their mental health.