|Gallery | Quotes | Relationship|
|Other Names, etc.||Yokoi|
|Japanese||横井るみ Yokoi Rumi|
|Anime debut||Episode 1|
|Manga debut||Chapter 1|
|Japanese voice||Kana Hanazawa|
|English voice||Monica Rial|
Rumi Yokoi (横井るみ Yokoi Rumi) is one of the main protagonist and narrator of Seki's games in Tonari no Seki-kun. She continuously attempts to pay attention in class, but is almost always distracted by her neighbor's antics. She sometimes tries to make Seki concentrate on class by sabotaging his projects, but usually finds herself joining in on them, though Seki misunderstands these attempts. She is rumored to like Seki.
Yokoi has bob-cut silver hair that grades down to grey. She has brown eyes.