Honestly I don't understand the hype for Hairu. She's clearly insane/bloodthirsty/etc. and I know she's been compared to Juzou, but frankly she doesn't have the same charm he had while he was still on the edge of sanity. Until she either shows more likeable traits or a backstory I'm not a huge fan of her. Obviously Ishida is great at making you like any character no matter what they've done, but he hasn't really done that with her yet. All she is at the moment is a cute girl with a murderous streak and major jealousy issues. IMO she's really overrated, though I'm still interested to see what Ishida has in store for her.