Before going to prison, Lyney was a skilled magician who enjoyed the showlight. He was, at first sight, very easygoing and friendly compared to his siblings Lynette and Freminet, who are reserved and introverted respectively, though he was said to be much quieter when alone with his sister. He and his sister were talented magicians, having learned from a man in their youth when they were living on the streets. Lyney remembers all of the people he is indebted to, and will always repay them, such as serving The Knave.

He does have some feline traits like his sister such as his eyes, his love for fish and a wish to sleep more in the morning. His tendency to be both intimate yet reserved also gives him a mysterious aura often related to cats. His constellation also has the word "cat" in it, just like Lynette. He often hides his tail and ears, as he finds them useless and weird, and doesn't want to be made fun of because of them so he hides them in his clothes, but now that he has to wear a prison uniform, he is unable to hide them, so he is constantly feeling vulnerable.

He cared greatly for his siblings, wanting to ensure that they had a home to live in and looks out for them whenever possible, becoming extremely irrational should their safety be threatened. Despite all his cheer, Lyney has a dark and traumatic past with his sister, but they have a very good relationship, likening it to the only truth in a world full of lies and falsehoods. As a result, he is willing to do anything to stay with her. Lyney is also implied to quite "proud", wanting to prove himself without relying on others.

Now that Lyney is in prison, he has developed depression and anxiety, due to constant fear his siblings are in danger. He constantly cuts himself and starves himself, thinking of it as a punishment for not taking care of his siblings. Lyney had developed an irrational fear of people, causing him to hide constantly, meowing constantly, aggression constantly, and constantly wetting himself as he was too depressed to use the bathroom... Due to his depression, he has become way more animalistic, which made other inmates call him "Cutcat", a reference to his self-harm.

Appearance Lyney has a feminine-like body. He is a young man with violet eyes, pale skin, and short ash blond hair, some locks being pulled back in a small braid on the left side of his head. He also has bangs with a small pinkish red strand on the right, covering almost a quarter of his face. Additionally, he has cat-like eyes thanks to their overall shape and their slit pupils. He also has a dark brown tear-shaped mark on his right cheek. On almost all of his body, he has self-harm scars, almost all of them being new and fresh.