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This, she is the only one that looks past his 'I'm an asshole' persona from the first moment, she takes no shit from anyone especially him, note that Bakugou tends to respect those who take no shit from him, and Jirou doesn't, that put's her in the top rankings alongside Momo.
Also I'm always so confused why she isn't like always considered BakuSquad, she is probably the one person of that friend group he can straight up stand normally, what's the bet it was a subconscious choice, "I need someone snide as shit in this group of idiots, she's just about the only person I can stand for that reason, she's in."
I think of the gang the only person who she hasn't really interacted with on screen is Kirishima, but plenty of showings with the others.
Jirou isn't insular in who her friends are or who she interacts with because everyone in class likes her, there's another post about this but like everyone likes Kyouka, I can't think of anyone who doesn't have a good relationship with her, hell if we take the Radio show being canon into consideration, even Monoma who rags on Class 1-A likes her to some degree.
bc I'm tired of seeing their friendship being slept on outside of fanfic
Exhibit A: The Bus
Class 1A don't know each other very well yet, but some of their most introverted members have already figured out who they're okay sitting next to (notice how todoroki's sitting alone bc we're too early in his arc btw). and look at her only mildly annoyed with his antics while everyone else freaks out at this gremlin
Exhibit B: Music
first of all dude was never gonna say no, and the band shenanigans are iconic enough that I don't need to go into it very much but LOOK AT THEM NERDS
Exhibit C: The Joint Training Arc
Jiro is Bakugo's first save that isn't Izuku. They make a killer of a team, AND they judge people together. BFF shit.
Exhibit D: He lets her get away with this
untamed Kacchan would never
Exhibit E: she's part of the so-called Bakusquad and I'm tired of pretending otherwise
She's often with them in shots/panels, she has her obvious thing with Kaminari but she's also very good friends with Sero, she hangs out with Mina a lot like COME ON