Justin is best described as an impulsive youth with a moral core. He is often scolded by both his mother and Sue for acting rash in certain situations. His drive comes from his curiosity and will to learn about the world around him. He believes in keeping his friends close, while at the same time being protective of them. He often resents submitting to authority, which sometimes gets both him and Sue into trouble.

Justin always looked up to his father who was also an adventurer. His biggest accomplishment was discovering a large amount of species on the Old Continent. His father then unexpectedly dies one day, although never revealed, on an adventure when Justin was only young, leaving him in the care of his mother Lilly. Since that day, Justin has treasured his father's memento: a green stone with ancient and foreign symbols. Justin was convinced that it was the real fabled Spirit Stone from the fabled Angelounian legend. The Parm museum Curator noticed this and had high hopes for him. Justin had always loved adventuring with his friend Sue and her pet Puffy, who was actually a creature Justin's father discovered one day during his travels.