Coco Hero Strings

The Two Strings of Hero Coco is a crossover between Big Hero 6 (2014), Coco (2017) and Kubo and the Two Strings (2016). In this crossover, the main characters are Hiro Hamada, Miguel Rivera and Kubo (as well as Baymax). While the crossover is fairly new, it has become incredibly popular in fanart. This EU is considered an amalgam of Big Coco 6 and Coco and the Two Strings.

Baymax
Baymax is normally a supporting character and is usually there as a sidekick or just to give them a ride home, as well as Ttheir healer.