In 'like' as 'love', probably not. But it's possible.
In 'like' as in just 'like', well, maybe. He's insane, remember? It's not clear whether or not he likes Saya because he's like that.
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He is Saya's chevalier, he is always with her and when he is not he is waiting. Saya belives he and her have more of a family like relationship,but Hagi is in love with Saya.
They can't have children because they both have the same blood.
You mean Riku? Well, he gets killed by Diva Saya resurrects him by turning him into her chevalier Then Diva rapes him and she accidently kills him, killing him permanently
She wants him to kill her when everythings all over because she believes that chiropterans shldnt existed in the human world
No he does not. At the end of the last episode Haji leaves a rose with a ribbon tied around it for Saya at the grave.