the female characters in the show is just..idk

i rarely see people talk about this issue. the female characters are all 14 or 15 years old and i see them frequently being sexualised. like yada what was that???? irina is more adult and i did enjoy her character. needless to say kayano's initial personality was her distaste towards her small boobs. like thats all teenage girls are worried about. later we are revealed that her character is this potential threat to koro sensei. but likewise she is defated by the power of true loves kiss??? i dont know . the male characters get their hype scenes tho.and kayano is fleshed out less than five secconds in when she tries to help koro sensei in his fight gainst shiro. also its just the sexualisation and uselesseness ,compared to male characters like nagisa,karma,sugino etc. that sets me off. other than that i enjoyed the show. i think. i did like karasuma . he was nice