Teru Momijiyama/Relationships

Iko Koishikawa
She first met Iko as Shy, when she was at Himawari Land as a guest to Hero Heartman's show and she saved not only her, but also her brother and other civilians. However, for a long time, she felt guilty about her current condition and it got worse when Koishikawa was transfered to her school due to being the closest to her home than her old school; Teru immediately recognized her since her poor performance as a Hero that day made such a social represalia to her that she was afraid to appear in public again. Politely, Teru called her "Koishikawa-san" (さん), but recently started to call her by her first name, "Iko-san" (さん), at her request.

When they're alone at the nurse's office, Teru had the courage to ask her if she's not angry at Shy and tears up at her response: she wasn't angry at her since she made her best to save her and the others, and that's why she admires her. With Stigma using Iko's hate for herself to transform her in a monster, Shy is forced to appear and tells Iko that she will help her in any way she can, even if she gets hurt in the process. She accepts Iko's pain and successfully saved her. To thank her for that, Iko took Teru in a hangout.

Even though Iko is not a Hero herself, Teru truly respects her for her personality and way of helping others, specially children.

Spirits
Teru is acquainted with Spirits as she calls her "Pepesha-san" (ペペシャさん) and looks up to her as her mentor. She also thinks deeply about the advice she gives her as she took her teachings about Hero life very seriously. It was Spirits' words about how she couldn't save everyone that gave her enough courage to transform and help those in danger.

Stardust
Shy has never met Stardust until she, along with Iko and Spirits, is called to the Heroes Hideout by Uni-Lord. Before and during her fight with him, Shy tried to appear confident even though he was trembling and scared of the other Hero. Even though Stardust beat her up and gave her every reason to hate him, Shy still managed to see kindness in his actions, and claim he had a heart.

N-Villio
N-Villio is Shy's partner and due to his resemblance of a shrimp, she calls it "Ebio-san" (えびおさん). She trusts it to help her out while she is doing Hero's business and always contact it when something's happening, just as she did with the building on fire and moving out her battle with Iko Koishikawa's corrupted form to another place other than the school.

Unnamed grandfather
Even though she didn't understand his words about living up for someone else, Teru, as Shy, rephrased him after finally understading what her grandfather meant by living through others due to the kindness they show to them to Iko Koishikawa after she was successfully saved by her.