Flipper began as a wolf companion discovered by Kenichi during his mountain upbringing. When Kenichi returned to civilization at age 15, Flipper transitioned to life as the Kokuhō family pet. This wolf exhibits a face resembling that of a cat. Across all media, Flipper maintains a consistent role as Kenichi's loyal animal companion, with no development or expanded backstory in spin-offs, movies, or OVAs. Official media provides no additional details regarding Flipper's origins prior to meeting Kenichi, adventures beyond the main narrative, or character evolution in alternate adaptations.