Luke is very boisterous and opinionated, especially when it comes to things he dislikes. Due to his small physique and reactive outbursts, he is likened to a Chihuahua by the brothers, Diavolo, and even MC (if the player has chosen so), much to his dismay.

He's quite prejudiced against demons and warned MC to never trust them. Although Luke's narrow-minded, Simeon has stated that he's honest, genuine, and has a strict set of values. Luke is overall a very caring person who has a big heart and cherishes his friends, but he acts tough on the outside and dislikes it when people depict him that way.