Is Christian "Vashblade" Humber an extremely ruthless and sociopathic Anti-Hero at the dark end of Type V or a Villain Protagonist with very few redeeming qualities.
Another interpretation is that he's a deconstruction (intentional or otherwise) of fictional action heroes, showing what happens when someone receives virtually no formal education, always solves his problems with violence and is powerful enough that few people are even remotely a threat to him. He will kill the villains, but will also kill innocent people, and no one can protect them from him.
Kekanu could also be interpreted as a cunning good guy trying to stop "Vashblade", he's the only one who is able to beat the protagonist in a fight (Granted, he had help but this is fighting against someone who could punch suns) with a bit of forward-planning. Sadly, he was not to last, making way for the Corrupted-self to appear more often.
Designated Villain: If you're not familiar with the canon storylines of the works referenced, many of the villains' only "crimes" are opposing Humber or even merely being people he happens to cross paths with.
Draco in Leather Pants — For Vashbladehumber himself, played straight, as we're supposed to emphasize someone whose heroic batting average is lacking at best. Otherwise? Averted. There's even a scene wherein Roxas realizes Organization XIII are, pretty much to a man, total assholes, and assists Humber in deliverating them to oblivion.
In one case, inverted, as sympathetic FFX-2 villain Shuyin is painted as an "ugly" and twisted fiend, despite being a dead ringer for Tidus.
"Funny Aneurysm" Moment: Vash notes that the webcomic artist "sound(s) like an ASSHOLE" for making fun of Humber. Not long afterward, the Humber family contacted the artist, and he had to stop work on the comic.
Part One: Skinning street gangs alive, nailing them to walls, and leaving them to die; murdering a little girl who turned him in to the police for beating up the Japanese emperor, then murdering her entire extended family and the rest of her hometown.
Part Three: Murdering 6,000,000 innocent people at the Superbowl, followed by singling out one policeman for A Fate Worse Than Death. Also murdering a bunch of scientists later, but that aforementioned massacre is hard to follow up on.
It's worth noting that at the Super Bowl, where Vash teleported by accident and got surrounded by soldiers, Vash was (surprisingly) originally planning to fight his way out without killing anyone, but after getting shot in the shoulder, decides to kill everyone there just to show them what it's like to face Horteka in battle.
Part Four: Mocking the weeping family of a demon he just murdered. Not as spectacular as the above, but exceptionally heartless.
Part Five: Dragging dead Final Fantasy X bosses out of the Farplane and torturing them to death... or, rather, almost to death, thus bringing said holocaust-happy big bads back to life and promptly forgetting about them. He also forces a kid to remain silent about his whereabouts and bring him food every night by threatening to kill him and his entire family if he does not. Also murdering a group of 'Snobs' for no reason what so ever, other than the fact that they were rich.
Part Six: Marching on Washington, D.C. and killing numerous soldiers trying to defend the president when all involved could easily bypass them.
Rescued from the Scrappy Heap — Kagome, generally dismissed as the "annoying useless girl," is the only force in all of nature who can stop Humber once he goes berserk. He even trusts her with his panoply of megaweapons when he hops off to find Paradise.