Conversely, I've always had a thing for tertiary characters. In fact, a lot of my favorite characters from almost any franchise are either the side characters or villains. A lot of times, due to main characters having to be the audience surrogate, they don't always get fleshed out as much, because then it gets harder to relate to them. But side characters? I feel like they get just enough characterization to connect, but also don't pass the line of having an air of mystery that allows us to project our wants and needs onto them. The side characters are the ones that are often allowed to be messy, to say and do the questionable (yet memorable) things, whereas heroes have to remain moral to a degree. With Marvel it gets a bit tricky, because depending on the film, even the main characters can be side characters. Star-Lord, for instance- main character of Guardians, but side character in Infinity War (I know it's an ensemble film, but you know what I mean). Then you have someone like Wong, who's kind of a supporting character in everything he's in, but people love him. But I dig it- those side characters help the world feel more fleshed out, and when they get made into figures, it helps my shelf feel more populated too. Heck, I see it joked about all the time that you're not a true Star Wars fan if you don't have a favorite background character.