I personally really dislike needlessly rude or hostile characters (pinna from mind blind, to some extent TWH book 1 Ava) unless they have a somewhat reasonable reason for doing that (flyss from AMR being an example of the have a good reason to dislike mc at first).
Ofc 2nd will be the ROs we are forced to like and/or not have an option to express our true feelings of disgust black magic from heroes rise and junko from SoH , especially junko takes this cake for me.
3rd will be the ROs in which mc has to put basically one sided effort to maintain the relationship and in case of committing an apparent mistake ROs dont bother to put in any effort to continue the said relationship , just seems like a very taxing thing for me , a prime example would be some ROs from Till Death do us apart like lich arcy and spider molloth a lot more but i cant remember them now.
4th will be ROs with no redeemable qualities whatsoever like Manekrol from TSSW .
Pretty sure there are more ROs i dislike but only these are coming to mind rn.
5th Ah yes totally forgot about the ROs who make a successful or unsuccessful attempt on mcs life (looking at you leomar) they are just a HUGE NOPE for me.

