Santana is the alleged scion of the music industry power couple █████████ and █████████. While Santana's purported parents have not publicly acknowledged having any children, their reclusive habits make secret offspring plausible. █████████ and █████████'s halftime performance during the Spies' playoff win against the Hades Tigers in Season 1 only served to further propagate rumors of a connection.
She will be dearly missed.
Rumors that the body found at the scene of her incineration actually belonged to one "Mimi Santana" were quickly dispelled by the commissioner's office. If Miki Santana did assume a false identity, leave town, and is currently enjoying her retirement on a beach somewhere, there's absolutely no evidence of such a thing.