|Appearance||Period 17: Black Forum|
Eiko is a tall, light-skinned girl with basic rounded eyes and very short light-colored spiked hair and wears a heart clip above her left ear.
In comparison to her more dainty friends, she appears to be boyish in style.
Eiko is said to often complain or make sarcastic remarks, much to the ire of Misa. She can be cynical and often suspects or teases the worst, such as claiming Misa probably complains about her on the forum, and teasing another friend and making her worry she's aware of her doing it; implying she's a lot more thoughtful than she lets on. But she's also a good friend who is usually in a good mood, and she was shown to express concern for Misa noticing how upset she was.
Eiko and the others were on their way home when Misa suggested they stop for some photo stickers at the subway. While this is Misa's favorite spot, Eiko called it old-fashioned and recommending that they check out the new location set up at the station. Noriko and Ryo agree and everyone was unaware of Misa's frustrations.
The next day at school Eiko becomes aware of Misa's strange behavior and expresses concern as Misa rationalizes that she must be the one responsible for starting the topic about her since only she would know certain details, and she's convinced she badmouths her too.
At the end of the story Eiko, Noriko, and Ryo showed up at the food place Misa previously visited and chatted about her, wondering if she really was capable of badmouthing her on the forum. Eiko claims she wouldn't be surprised, saying that you can't really read people entirely, and the way she words it causes one of the others to panic out of concern that she also occasionally used the forum to badmouth Eiko. It isn't stated if they were aware about what happened to Misa.