Oliver Quick

Obsessed Pervert+Fraud+Multiple murders+Sexual assault+Stalker+vengeful and spiteful killer+Despite his awkwardness, he actually has good social skills when it comes to manipulating people to get his way, as he does with the members of the Catton family+liar+possessive+crook+manipulator+horny+He appears to have an unhealthy obsession with the Cotton family which leads him to do many disturbing things on impulse towards them.+Overall, Oliver is a person with a lot of pent-up anger that he took out in a cold and calculating fashion, murdering three people who genuinely cared about him in cold blood.

Oliver is a vengeful and spiteful killer who lurks beneath the mask of a relatively harmless demeanor. He blames those who found success in their social lives for making him feel so alone. This also shows a layer of hypocrisy to his character as the moment Felix invites him for drinks, he abandons Jake, his only friend at Oxford who has similar issues.

Despite his awkwardness, he actually has good social skills when it comes to manipulating people to get his way, as he does with the members of the Catton family. This also ties in with him being a pathological liar who abuses people's sympathy with fake stories from his past for his own gain. He lied to the Cattons by claiming he had a harsh upbringing, and he lied to his parents to make excuses for not visiting.

He seems to have an unhealthy obsession with Felix that causes him to do many creepy things on impulse regarding him. He would watch him have sex with girls through their window at college, lick the semen from his bathtub, and, after his death, masturbate into his grave. While him crying at Felix's funeral may indicate that he felt remorse for killing him, he clearly didn't regret doing it years later when he tells Elsbeth that while he loved Felix, he was never "in love" with him and actually hated him deep down.

Overall, Oliver is a person with a lot of pent-up anger that he took out in a cold and calculating fashion, murdering three people who genuinely cared about him in cold blood.