Although the Blood Knight is a simple concept, as the characters in question are just people who want to fight for fun, in reality this is far more complex than it seems. Hence a scale,

The Mindset of the Blood Knight...

The BoisterousBruiser kind: A person under this kind of mind set sees any opportunity to engage in a combat as equivalent to throwing a party. They see it as fun, exciting, and something everyone can participate in. Examples : [[TheIncredibleHercules Hercules]]. These are very rarely villainous, and tend to be good guy kinds.

The SpiritedCompetitor kind: They are up for any kind of challenge without question. They do not enjoy hurting their opponent, but they certainly enjoy the battle as a personal challenge. They are usually under more fair and sporty about their challenges, and are generally the least violent kind amongst these four kinds of BloodKnight. Examples : [[VideoGame/StreetFighterII Ryu]], [[DragonBall Goku]]. These tend to be heroes.

TheUnfettered kind: One who has not only devoted his life to the fight, but who is bloodthirsty and is not above amoral acts to get what he wants. However, he usually has [[NobleDemon some kind of moral code]] or [[WorthyOpponent respect for his opponents]]. He will probably not fight someone who doesn't want to fight him (because it will not pose a challenge) and will have enough self-control to not kill indiscriminately, but he will probably not have issues with killing (it is part of fighting, after all) and neither he will have any compulsions against fighting anyone no matter where he stands (ally or antagonist). This kind's most noticeable trait, still, is putting his love of fighting above matters of right and wrong. Examples: [[VideoGame/StreetFighterII Akuma]], [[Manga/{{Bleach}} Kempachi]], [[{{Berserk}} Zodd]]. In terms of alignment, these tend to be antiheroes or villains.

The AxCrazy kind: It says it all. The Ax Crazy Blood Knight has sacrificed their morality AND sanity for the sake of battle and bloodlust. He will most likely kill anyone who stands in his way, not care about collateral damage and generally be a [[TheBerserker berserk]] of the worst sort. You are very much not safe next to them, needless to say. Examples : [[{{Warhammer40000}} Khorne]] and the vast majority of his followers (although he started up as a type 3, and still has some parts of a type 3), [[FullMetalPanic Gauron]]. These are almost exclusively all evil, with ChaoticEvil being the next-to-canonical alignment for them. Only the darkest of antiheroes and the most bloodthirsty of villains happen here.