Active and competent example: Rocket Raccoon. Side character. Irascible. Not an anti-hero .. he's just from a species that isn't traditionally known to be social in the first place (perhaps his mother was kidnapped from the forest rather than a city, his MCU-specific backstory is unclear), he doesn't even know he's part of a larger species of creatures not really too much different from himself, and has been treated like a freak by the oddly shaven-apelike aliens of the MCU universe, so of course he has an abrasive personality. One might feel sorry for him more than they actually "like" him.