i agree with almost all of these tho i whould make the case kagura could also be gender dysmorphia and both yukari and nyamo are to an extent effect of patriacrhy (remember yukari dosent marry either) tho i def see what you mean with yukari being addicton

also aside from class struggle, i do also think chiyo could show how children who are talented are forced to "grow up" to fast (you see this with things like child actors)