Hey..I don't know if you would listen but hear me out. An au where from inside out Riley moved to San fransokyo rather than san Francisco. Like she got in big hero 6 while her emotions deal with the situation( and lol meeting Tadashi and developing a crush on him....)
(all the “dream boyfriends” in riley’s mind suddenly start to wear baseball caps and cardigans. everyone in her mind just kind of. face palm. joy is ecstatic though bc tadashi is great! sadness meanwhile is like “but he’s older than us by a lot” and disgust is also like “but he’s older than us by a LOT” but they let the crush stay so long as its minor and innocent)
I feel like Riley would not be part of the team, but more so an outsider who knows them. Perhaps Hiro and Tadashi and Aunt Cass are her neighbors, and she met them when Aunt Cass brought over some baked goods as a “welcome to San Fransokyo!” gift. She goes to the showcase simply because Aunt Cass invites her and her parents to, to see some of the great work of the people who go to SFIT and to also get a tour of the area of San Fran around the institute.
When the fire happens, I’m sure all her emotions just go nuts. Fear takes control then, trying to get them to run away, but then Riley notices Hiro - a familiar face in her new unknown city - and the emotions all get worried and fearful for him. So Riley goes over to him, helps him stand up, and then she hears from Hiro where Tadashi is.
But if Riley’s emotions went quiet in horror at that, I can hardly imagine what was happening in Hiro’s mind as is emotions reacted to the explosion that had just knocked them all back and had also taken their brother away.
Riley helps Hiro though in the weeks after, by being a friend not too much younger than he is, and by understanding that sometimes its okay to be sad and he shouldn’t bottle it all up (unless he wants to end up holding it all inside like she had, not letting herself be sad, and almost running away from home because she didnt understand how to cope)