well there isn't any bad blood, i think the only person he won't really talk to is sasha or any of his former teammates which is completely right, those person don't deserve to be in his life anymore,
some? i can give you a whole google doc of them, its not my doc but its updated once a month, has tons of yandere/obsessive manga's https://docs.google.com/document/d/1rfm8knOG6iiJ8xyLAltVvcGNdRimVKtGqHMiI5O0cLE/edit?tab=t.0
Yandere mangas are the best, please no on the harem part, cause that just sours the yandere part unless they were yander themselves i doubt it would work
Iv never read the LN, so this is all new to me, but yea i hope he stays solo and never forgives sasha cause from what iv seen she hasnt down anything worthy of forgives infact just the reverse,