Excluding Brawl, Mario and Sonic should never have coexisted in the first place. M&S at the Olympic Games has opened the floodgates for spin-offs unworthy of carrying either mascot's name, and crossovers in general have a reputation for tarnishing the integrity of all parties involved. Additionally, Mario and Sonic's newfound friendly sporting rivalry has toppled their respective companies' longstanding mutual hatred for each other, which is an awful thing to do.