Rindelle

Though they "get along" for now, I have a feeling that Iza and Sana are not for each other and will eventually separate, whether by Iza abandoning Sana or killing her. She wanted to be loved as a human while Iza wanted her to embrace being a monster. Hence Sana will never truly fall in love with Iza, she merely resigned to being immortal and unable to escape, using the red fox's love to somehow cope. As for Iza, while I think he does love Sana (in his own monster way), he's like a time bomb that will eventually explode over time after not getting the love he wanted from Sana. For someone like him, his previous true love who accepted who he truly is was a good match until she cheated on him. There's that potential first love too when he was the 1st King Ibana, she was more loyal and would've been perfect, if only he was not clueless about love at that time. He needs someone who accepts him as a monster (former "true" love), loyal and will love him wholeheartedly (potential first love), and can keep his "thing" in check (which only Sana managed to do). Of course, whether he deserves someone like that after all the atrocities he did.... haha, not at all. So yeah, let him suffer in loneliness and remain unloved.

Are y'all stupid? There's literally the word "Yandere" in the title. It's painfully obvious that this manga is for people with particular taste. So why the hell are you so shocked? Definition of "fuck around and find out", smh.