Mmm when you get side/ supporting characters that are like, say, a skeleton with a glowing book for a head and no where at any point in the story, does it remotely touch on any world building aspect that would allow for such a creature to exist. And yet, there they are for the entire plot, trodding along with the MC being a spoopy book skeleton that's also like a super quirky powerful mage ... because it's funny when they get hit and their bones fall apart, I guess.
**Sorry didn't mean pet, an actual character that would've otherwise been a normal human/ common place sentient being friend of the MC, but instead is a weird otherworldly creature for reasons that remain unexplained.