Iko Koishikawa/Relationships

Family
As her parents died when her brother was really young, Iko took the responsability to take care of him. She assured him that someone would save them from the rollercoaster and so it happened: Shy appeared. She had a lot of resentments from the time of her parents' death and started hating herself thinking she was the one who caused them to pass way but when the Japanese Hero made her finally notice that it wasn't, she finally feels better about herself.

Shy (Teru Momijiyama)
Shy is the one who saved her back then at Himawari Land and Iko truly is grateful for her. Different from those who blamed the Hero for her current condition, Iko didn't thought this way, telling Teru (who is Shy, but she didn't know at the time) that she admired Shy for what she does for people. When meeting Teru for the first time, she was polite and finds her to be a gentle person just like Shy, comparing them.

By the time she is transformed into a monster by Stigma, Iko can't control herself and is afraid of hurting Teru in any way, telling her to stay away from her and even attempting on killing herself to prevent herself from doing so. However, Teru stops Iko as she reveals to be Shy and tells her that she will help her in any way she can, even if she gets hurt. After successfully saving her, Iko takes Teru in a hangout and is happy to be Teru's only friend and also the only one to know that she is Shy. Iko got truly excited when she said something Shy would.

Iko accompanies Shy to the Heroes Hideout and just quietly watches all the discussions between the Heroes. She is totally against Shy fighting Stardust and watches in anguish as her Hero is completely overpowered by him. It gets to the point where Iko begs Shy to give up so she doesn't get hurt anymore, but she's still very determined.