Klaus' relationship with the others:
- Alak - Klaus keeps an eye on Alak most of the time partly because of his flirtatious behavious and partly because he cannot miss an opportunity to have a laugh on Alak's expense
- Aleksy - Sharing the passion for artifacts with Aleksy, Klaus can easily get lost in long conversations with him; he appreciates Aleksy's knowledge on the topic, always ready to learn more about obscure artifacts
- Aoi - Klaus and Aoi collaborate in many projects; although Aoi is quite antisocial Klaus provides for the both of them in otder to keep their professional relationship working
- Cain - Klaus and Cain bicker most of the time since Klaus enjoys stepping on Cain's nerves; even so, Klaus always takes Cain's words into consideration, still feeling like he owes Cain for what he is today
- Cecil - Klaus gets along well with Cecil but their friendship is kept to professional levels; as long as Cecil continues to pay well and do business with him all is well
- Damien - Klaus likes Damien; he felt attracted to her enough to put aside their differences as species; even so, he didn't want to try a real relationship with her and ended up having a sort of a friends with benefits situation with her for a few years
- Elyon - Elyon is the only person around whom Klaus feels self-aware; her way of being disarms him to such a point that he feels as lost as a child in an adult's world; this is why he loves her so much, as she makes him want to be a better person not only for himself but for her as well
- Illya - Best friends for over a hundred years, Klaus is the chaotic between the two, often dragging Illya into crazy adventures; they bonded over their different way of living; trusts him with his life
- Kara - Klaus likes Kara and more than that, he respects her; he knows part of her story, much to her annoyance, and is always ready to help her with whatever she might need
- Kieren - Klaus' patience stops short when it comes to shy people; even if he thinks Kieren is cute he doesn't have time for Kieren's shyness
- Marshall - Klaus and Marshall have moments and moments; Klaus find's Marshall's strategic mind too boring at times, especially when he proves the flaws in Klaus' many plans and ideas
- Mina - Klaus and Mina don't get along all that well and they don't try to either; Klaus doesn't really like that she's so undecided most of the time
- Mollymawk - Klaus considers Mollymawk a good friend; he likes Molly's chaotic side, always up to do something crazy; he feels like Mollymawk understands him better than a lot of other people
- Nathan - KIaus sees Nathan as too rigid; he sees Nathan as someone who is too focused on getting even the tiniest detail perfect instead of exploring all the things life has to offer
- Novalie - Klaus finds Novalie cute and easy to flirt with; although he has no sort of romantic intentions with her, Klaus likes to show his kind and playful side towards her
- Selene - Klaus gets along really well with Selene and is always happy when she agrees to be part in one of his crazy things; although not all the time, Klaus participates in the effort to make Selene more sociable
- Stephan - Although Stephan can get on Klaus nerves pretty easily, Klaus holds no grudge against him; he is pretty neutral about Stephan and prefers for things to remain that way
- Viola - Klaus and Viola are usually on friendly terms; he more often than not likes to give her fractures of ideas, in an attempt to make her want to experience more things
- Yulya - Klaus sees Yulya as a good partner in crime; he likes her wild side, never getting tired of her teasing; he finds her boldness refreshing in a world full of lies and do-gooders
- Alak - Klaus keeps an eye on Alak most of the time partly because of his flirtatious behavious and partly because he cannot miss an opportunity to have a laugh on Alak's expense
- Aleksy - Sharing the passion for artifacts with Aleksy, Klaus can easily get lost in long conversations with him; he appreciates Aleksy's knowledge on the topic, always ready to learn more about obscure artifacts
- Aoi - Klaus and Aoi collaborate in many projects; although Aoi is quite antisocial Klaus provides for the both of them in otder to keep their professional relationship working
- Cain - Klaus and Cain bicker most of the time since Klaus enjoys stepping on Cain's nerves; even so, Klaus always takes Cain's words into consideration, still feeling like he owes Cain for what he is today
- Cecil - Klaus gets along well with Cecil but their friendship is kept to professional levels; as long as Cecil continues to pay well and do business with him all is well
- Damien - Klaus likes Damien; he felt attracted to her enough to put aside their differences as species; even so, he didn't want to try a real relationship with her and ended up having a sort of a friends with benefits situation with her for a few years
- Elyon - Elyon is the only person around whom Klaus feels self-aware; her way of being disarms him to such a point that he feels as lost as a child in an adult's world; this is why he loves her so much, as she makes him want to be a better person not only for himself but for her as well
- Illya - Best friends for over a hundred years, Klaus is the chaotic between the two, often dragging Illya into crazy adventures; they bonded over their different way of living; trusts him with his life
- Kara - Klaus likes Kara and more than that, he respects her; he knows part of her story, much to her annoyance, and is always ready to help her with whatever she might need
- Kieren - Klaus' patience stops short when it comes to shy people; even if he thinks Kieren is cute he doesn't have time for Kieren's shyness
- Marshall - Klaus and Marshall have moments and moments; Klaus find's Marshall's strategic mind too boring at times, especially when he proves the flaws in Klaus' many plans and ideas
- Mina - Klaus and Mina don't get along all that well and they don't try to either; Klaus doesn't really like that she's so undecided most of the time
- Mollymawk - Klaus considers Mollymawk a good friend; he likes Molly's chaotic side, always up to do something crazy; he feels like Mollymawk understands him better than a lot of other people
- Nathan - KIaus sees Nathan as too rigid; he sees Nathan as someone who is too focused on getting even the tiniest detail perfect instead of exploring all the things life has to offer
- Novalie - Klaus finds Novalie cute and easy to flirt with; although he has no sort of romantic intentions with her, Klaus likes to show his kind and playful side towards her
- Selene - Klaus gets along really well with Selene and is always happy when she agrees to be part in one of his crazy things; although not all the time, Klaus participates in the effort to make Selene more sociable
- Stephan - Although Stephan can get on Klaus nerves pretty easily, Klaus holds no grudge against him; he is pretty neutral about Stephan and prefers for things to remain that way
- Viola - Klaus and Viola are usually on friendly terms; he more often than not likes to give her fractures of ideas, in an attempt to make her want to experience more things
- Yulya - Klaus sees Yulya as a good partner in crime; he likes her wild side, never getting tired of her teasing; he finds her boldness refreshing in a world full of lies and do-gooders