I kind of love how unabashedly nerdy some of the cast is. Yes we do have our usual fantasy sticklers, but for the main duo and the supporting cast to just nerd out in their free time is very funny.
I guess you could also just call them characters that have passions, things they care about deeply outside of social circumstances. It’s easy for characters to be written with a ‘gimmick’, something that defines them in-story and for the audience to latch on to, but weirdly I don’t feel like I’m being marketed a trope as much as I do other series in the genre.