Mario is a dog who appears in The Brave Fighter Exkizer as the pet of the Hoshikawa family. He is a Chow Chow crossbreed and the only character besides the boy Kouta Hoshikawa who knows about Exkizer, the alien robot that has taken refuge in the family’s car. Because of this secret, Mario often acts up intentionally to distract others from noticing Exkizer’s activities or to cover up anything that might reveal the robot’s presence. His background is that of a loyal family pet who becomes an unwitting ally in the battle against the Geisters. Mario’s personality is clever and protective; he shows a strong bond with Kouta and a willingness to help in his own canine way. His motivations are simple: to stay by Kouta’s side and to help keep Exkizer’s existence hidden from the rest of the family and from the public. In the story, Mario serves as a supporting character who provides comic relief and occasional assistance, using his natural behavior to divert suspicion. His key relationship is with Kouta, but he also interacts with Exkizer and the other Hoshikawa family members. Mario does not undergo significant development over the series, remaining a consistent and faithful companion. He has no supernatural or combat abilities; his notable trait is his instinctive ability to sense when something is amiss and his tendency to bark, whine, or cause a fuss at just the right moment to draw attention away from Exkizer. Mario’s role, though minor, is important for maintaining the show’s premise that Exkizer’s presence must remain a secret to the general public.