Spike is spunky and energetic and is always ready and determined to get a job done. Although he has a bit of an attitude, Spike is virtuous, good-nature and kind, insisting that he would never do anything harmful or destructive. In the Ape Escape anime, Spike is shown to have genuine concern for the Piposaru in spite of their destructive and aggressive tendencies, and becomes upset at the thought of possibly having hurt one.
Spike also possesses immense will power, having been able to resist Specter's attempt at mind control through sheer strength of will alone (although it is unknown why he was unable to resist the hypnotizing TV broadcasts that later occurred in the series).
He is incredibly athletic and somewhat competitive, often besting his friend Jake in every area, leading to a mild buildup of resentment and rivalry that would later be exploited by Specter. Spike's weakness is his simple-mindedness, especially in comparison to his highly intelligent and scientific friends, Natalie (Natsumi) and the Professor.
Spike appears alongside Specter and lots of Pipo Monkeys. Specter challenges the Heroes to battle his army of Pipo Monkeys. The heroes defeat all of them and Spike heals the monkeys. Specter, Spike and the Monkeys join.