Gray is based on the Lizard in the original Alice in Wonderland. He works for Nightmare, though is often reduced to acting as a nanny of sorts in order to force Nightmare to do his work, and tends to be a workaholic, pushing his subordinates to do the same. In contrast, he is notably a poor cook and artist, despite his best efforts. By nature Gray is a kind man who cares for people and animals, but he is also a former assassin and a deadly combatant. As a result, he is unwillingly Ace's designated sparring partner as he is the only one who can match the Knight of Heart's skill. Gray often compares and sees himself as inferior to Julius, particularly in regards to his relationship to Alice.