That's an interesting one because I always felt the balancing act with Klaus was less about traits and more about permission. He's technically a hybrid, but the show often uses his vampire side as the default setting for power displays and his werewolf side as an emotional anchor, or maybe a curse he has to manage. The human traits don't really come from his biology, I think—they come from his history. A thousand years of living forces a kind of perspective; his fondness for art, his strategic patience, his occasional weariness, those feel like accretions of experience more than inherent humanity. His supernatural sides are immediate, reactive forces. The wolf is rage and pack and a monstrous physicality he spent centuries locking away. The vampire is speed, compulsion, and a predatory charm he leans into. The 'human' is just... Klaus being Klaus when he's not actively being either of those things. It’s the version that paints, that schemes for a kingdom instead of just killing for it, that craves family even as he destroys it. The show never lets him be just one thing, which is why he works. If he was always in hybrid mode, he’d be boring. The tension is that he can switch from discussing Renaissance techniques to ripping a heart out in the same scene, and both feel authentic to the character. That’s the balance: not a blend, but a volatile mixture.
I've seen some fans argue that his human side is his capacity for love, but I think that's too simple. His love is intensely possessive and destructive, which is deeply supernatural in its extremity. A more human love might have forgiven or let go. His tragedy is that he loves with a vampire's eternity and a werewolf's ferocity. The so-called human traits—his artistry, his wit, his occasional vulnerability—are like islands in that storm. They make him compelling because they're fragile. You get glimpses of what he could have been without the curses, and then the monster reasserts itself. That push and pull is the core of his character, not a neat 33.3% split. He's not a balanced cocktail; he's a lit fuse.