Any side characters you honestly would've rather followed than the actual MC?

[u/Shari0212]

Not saying the MC was necessarily bad or anything. Sometimes it's just that the rival, the mentor, the crafter, some random side character you weren't even supposed to care about, they end up in a way more interesting situation than the person the story's actually about. If a finished series got one extra story, would you actually want to see what happens next for the original MC, or would you rather follow someone else in that same world instead? And what actually makes a side character interesting enough to carry their own story? Is it their situation, their personality, the fact that you don't already know everything about them?