okay but imagine yn x error but yn is dating geno and he goes missing so yn assumes he's dead. until years later error is destroying their universe only to spot them and kidnap them into the antivoid claiming that he is yn's dead boyfriend.
Headcanoning that Rosalina from Super Mario Galaxy is the mysterious "higher power" that Geno from Super Mario RPG serves solely because the concept of a seven-foot-tall sparkle princess magical girl star goddess being cosmic archenemies with a giant robot Santa Claus with a gun fetish is in fact extremely funny.