Garret Fox is a very charismatic man. Despite spending a lot of time alone conducting various experiments, he is often called a ladies' man. He is fascinated by heat and steam above all things, and the windows of his modest apartment are often heavily condensed.
Garret treats Victoria Ventura like a little sister and owns a a common jollin named Piston. He is also best friends with his main financier, Jules Yun, though he briefly troubled their relationship by sleeping with Adriette.
During the Atebus Masquerade Murder Garret was contained under suspicion of murder.
He is a middle child, with four sisters, which he credits with being able to have strong, lasting relationships. He is openly pansexual.