@owlette i KNEW you were gonna comment on how we meet again and it might seem like i'm stalking you but it's just out of love <3333
(joking...i just have a lot of time to read and a lot of stuff i'm into xD, which seems to be the same for you?)
that aside, though. i definitely see where you're coming from, and i hadn't considered the "relatable" aspect of these character types when they're introduced. in this case, he doesn't seem to have a huge part in the story/detract from the original point of the story, so i don't think him serving as a way for the audience to relate is the point of him existing. it doesn't even really matter since he wasn't introduced in such a way that relating is important. the story is still about kei and her job as a part-time hitman, and i hope it stays that way oooo:
you've read more than me (specific to this series and manga in general it seems), so idk if he has a bigger role later on, but i doubt it by the looks of how things are based on the chapter after this and chapters before.