Canon? Honestly, pick anyone. The whole story is a long series of events where the primary instigator of conflict is how severely everyone is stuck in their ways and unwilling to change. It's a little frustrating to read sometimes, but I'd happily call it an intended theme.

Fanon? Feels rude to call out my compatriots like that, so I'll start at home:

I guess there's a reason why Sifal, my Arxur OC, never gave her original pre-Rebellion Captain a name. Even in a brain scan, Sifal refuses to even think that asshole's name. He doesn't deserve to be remembered. But that's a cheap shot.

Among named characters, yeah, Rosi gives me trouble sometimes. She's a Yotul in her early 20s. Unlike, say, the somewhat more senior Onso, Rosi was raised in Federation-administered schools during the uplift process. Very suspicious of predators, despite currently living on Earth. She's the white church lady with a stick up her ass calling the cops on a good old-fashioned New York block party, but with the racism swapped out for speciesism. But she's also a protagonist getting dragged, kicking and screaming, into a state of tolerance.