Oscar describes himself as a normal man with many quirks, and someone who is not fit to be the protagonist in any sort of story. After the deaths of his wife and daughter, he became severely depressed and even left his name in the industry. He also became lazy, dissolute, and grief-indulged. He was rather pessimistic and believes that humans are creatures that easily become tired of being sad or happy, and cannot continuously be either forever. He despised the ugly reality of the world, which is why he started drinking. However, thanks to the assistance of a doctor, he was able to overcome the alcohol and drugs but was left with a tremor in his hand.

Oscar kept to himself and was very secluded from the rest of the world. He did not read newspapers or magazines and rarely hung out with anyone. Other than his friends, the only people he had contact with were cashiers and deliverymen. He was very self-loathing and felt extremely guilty for being the only member of his family left alive, wishing instead to die along with them. Despite that, he has shown to be a responsible, supporting, and kind man with a playful side to him. He also deeply loved his wife and daughter when they were alive, as he was seen to be very selfless and would often put their happiness above his own. His family meant everything to him.

Although he wanted to get back to the writing industry again to honor Olivia's, his daughter's memory, he simply could not progress properly. The desire to write, however, had remained in his chest. Eventually, with the help of Violet, Oscar successfully writes a play and comes to terms with his daughter's death and that he is alive. After recovering, Oscar returned to the playwright industry, now appearing as a happier man.