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Haine is a genetically modified creation with regenerative abilities and a darker personality lurking in his mind.
Haine was created and trained as a young boy to be a powerful weapon, thrown into situations that have left almost permanent scars on his psyche and a collar around his neck. He has a general dislike of women after being abused by a female scientist and killing his "sister", Lilly. The lasts images from Lilly still hunt his mind and dreams, so he can't be touched by another woman without remembering her smile and how she died.
Giovanni, also a childhood friend, constantly tries to kill him and seem to be the only one that, just like Haine, survived from the laboratory. Giovanni always says that Haine should "wake the dog inside him". Giovanni shows some kind of envy towards Haine, and both of them constantly have intense fights since both of them can't really die so easily. Sometimes Haine seems to almost loose control, allowing the "other Haine" on his mind take over, becoming a kind of a "berserk mode", killing anything and anyone on his way. He seems to be controlling himself pretty well and he currently seeks to free and protect other genetically modified humans like himself and even saved an angelic-looking girl named Nill during Volume 0 of the manga, which after a while, he doesn't mind to be around and touch her.
He carries what appear to be a pair of Luger pistols, one connected by a chain that can be used to strangle anyone who comes to close. His body has been genetically modified to be able to withstand practically any form of punishment and can be regenerated almost instantly. After all his intense training on the deep underground, he can easily kill anyone, and always rush to the front of the battle since he can regenerate himself quickly. His only weakness appears to be head trauma, but being a main character in this story Haine has not faced that problem yet. At least not physically.