Karmiro

Karmiro is the Het ship between Karmi and Hiro Hamada from the Big Hero 6: the Series fandom.

Canon
Before Hiro joined the SFIT, Karmi was the youngest student to attend it. However, she had no friends and had issues socializing. Professor Granville noticed this, and after Hiro officially joined as a student, she saw the similarity between both and decided to help her by using Hiro.

Karmi is a huge fan of Big Hero 6, and even has made fan-fiction stories involving her being rescued by the team. She nicknamed all of the team's members herself because she doesn't know their true names or identities either. Due to this, ironically enough, she also fantasizes about the "hero" Hiro being her lover, since she does not make the connection that her crush and the "civilian" Hiro are in fact the same person.

But Karmi is Hiro’s classmate and rival, he was both discouraged and often put out by Karmi's stuck-up attitude. Though sharing the spotlight as SFIT's youngest student with her held little importance to him, he often tried to get on Karmi's good side in a few episodes, but eventually played along with the civilian rivalry with little care.

Hiro is embarrassed at the fact that though she hates his civilian form, she has a crush on his superhero alter-ego, not being able to distinguish the similarities between the two. However, their relationship has been shown to hint at friendly feelings, as shown in "Issue 188", where Hiro says that they have a lot in common, and that they could even be friends. Baymax then makes the situation awkward by drawing up a pubertic analysis explaining the connection bewteen them. The hint that the two may not see each other as complete rival is demonstrated again in "Small Hiro One", where Hiro notices that Karmi is locked outside of Trengrove's class, and he apologizes for her misfortune, receiving the first kind gesture from her; a small smile that appears to comfort her. Once again, their relationship appears to ascend in "Fan Friction", where Karmi is kidnapped by Momakase, and he comes to her rescue in his superhero form. The two share a friendly moment later on, where Karmi hugs "Captain Cutie" Hiro out of joy, and he appears to accept the gesture.

Fandom
https://bighero6.wikia.com/wiki/Hiro_Hamada#Karmi

Trivia

 * Karmi doesn’t like Hiro’s regular form, but has a major crush on his hero form