Class 1-B#
Itsuka Kendo#
Itsuka and Reiko are good friends. Reiko was the one who designed her outfit for the Beauty Contest, and helped her to prepare for the competition.[1] They also interned at the same place for the first[2] and second Work Studies.[3]
Yui Kodai#
Reiko and Yui are shown working together during their team's battle in the Joint Training Arc, both using their Quirks alongside Nirengeki Shoda's Twin Impact to attack 1-A's team. It is suggested that the two get along, as Yui expressed open concern when Reiko was knocked unconscious by Ochaco Uraraka, breaking her normally silent and quiet character. Yui also referred to Reiko by her first name, further suggesting that the two are close.
Class 1-A#
Minoru Mineta#
Although they aren't seen together, Reiko is shown to dislike him for his perverted behavior just like the other girls in Class 1-A. When Minoru used an Ultimate Move to bounce around the field during the Joint Training Battle, Reiko called him the worst and retreated, not wanting him to touch or bump into her.
Denki Kaminari#
During a hot pot party with classes 1-A and 1-B, Denki offered to help her and Yui with some shrunken sofas, but Reiko declined his help and used her Quirk to place them down.[4]
While they do not interact on a daily basis, she did show concern for his safety during the Paranormal Liberation War.