Considering just how competitive and cocky Sonic can often be, it's no wonder why he's ended up forging so many rivalries over his many adventures, but he's not the only one who's been part of a fiery feud or two. In fact, there are plenty of intense rivalries that have been showcased throughout the series, and though this is usually just because two characters don't get along or simply want to prove who's the strongest, other times, it can be a lot more personal and a little more complicated than it initially seems on the surface.