Sparkster is described as a very kind, humble, happy-go-lucky, and down-to-earth type of fellow. During his duties as leader of the Rocket Knights, he doesn't hesitate to help everyone in need. Rejecting others is a strict 'no' for him, which earned him quite a big reputation as the savior of Zephyrus and Eginasem. However, he appears a little shy and can't really deal with any sort of flattery, which often resulted in him fleeing the scene whenever one of the princesses tried to thank him for his loyal deeds. Despite all of his positives, he also has a very serious side. His sense of justice is what keeps him going on to fence off any evil. Especially his distaste and hatred for his nemesis, Axel Gear, shows a rather hot-blooded side of him, as he will never forgive the ex-Rocket Knight's acts of treason, abduction of three princesses, theft of the Secret Book of Rocket Knights, and the murder of his foster father, Mifune Sanjulo.