Klaus is cruel, short-tempered, manipulative, reasonable, strong, self-preserving, cold and ill-mannered, powerful, narcissistic, manipulative, bad, not pure evil, sadistic, also is compassionate, sensitive, passionate, perceptive, lovable and extremely emotional, has unique way of showing love, gives loved ones all his attention and focus, is soft around them. Klaus feels guilt and remorse for most of his actions, he just does not show it, uses his cruelty to hide fear of being alone