I had some trouble fighting with all of them, but I liked all of them.
I don't really hate it, but except for Shelke, they all kind of died in a cliche way.
I liked Azul 'cause he looks like a muscle man, but he's pretty damn intelligent, although he dies happy 'cause he got his ass whooped by a worthy opponent or something.
Rosso, she was interesting. Had the "Bride of Dracula" thing going for her. She's sadistic, but possibly masochistic as well. She chose to off herself rather than get offed by Vincent, which I can understand as her being prideful.
Nero was cool. Aside from that Hannibal character them, he played the part of fan service, with his brother-complex LOL
It still cracks me up that line:
"Let us come together". I mean, that's more slashy than "Let us become one"
Shelke, what can I say? She has a sympathetic past and she's not really a villain. It's kind of freaky to realize she's 19 and looks like a 10 year old. Not to mention she's got Lucrecia's brainwaves implanted in her head.