His sister, Mirabel, would be a great pairing. They could have adventures together, with Mirabel's determination and Camilo's shape - shifting ability. They might team up to find out more about the secrets of the Encanto or deal with a problem that the family is facing.
A fanfic could focus on Camilo's relationship with his family members in a more in - depth way. For example, exploring how he interacts with his siblings when they are all facing a new challenge together, like a sudden change in the magic of the Encanto. He might use his powers to cheer them up or help them out in unique ways.