Gatchan, fully named Gadzilla Norimaki, began as an egg discovered by Senbei Norimaki during a prehistoric time-travel expedition. This egg hatched into a cherub-like being with green hair, small wings, antennae, and no discernible gender. Initially singular, Gatchan later formed a chrysalis and emerged as two identical entities—Gatchan #1 and Gatchan #2. Replication continued, resulting in at least eight Gatchans in future timelines. Arale Norimaki coined the name "Gadzilla," blending "Gamera" and "Gojira" (Godzilla) in homage to her love of monsters. Gatchan communicates through nonsensical sounds called "Gatchanism," intuitively understood by Arale. The character bubbles with cheerful innocence, often mimicking Arale's playful antics. A defining trait is an insatiable hunger for metal objects and a distinct aversion to rubber. Functioning wings grant flight capability, while antennae project defensive or retaliatory energy beams known as the Antenna Beam. A pivotal series revelation uncovers Gatchan's celestial origin: an angel dispatched by the God of the Galaxy to stifle Earth's technological advancement by consuming metal and replicating endlessly. This mission aimed to prevent humanity from reaching a destructive industrial stage observed in other civilizations. Senbei Norimaki thwarted the plan by relocating the egg to Penguin Village. Witnessing Gatchan's integration into the Norimaki family and Penguin Village's harmony, the God of the Galaxy spared humanity. Gatchan appears across multiple media. Within the Dragon Ball franchise, the character aids Arale—disintegrating a tree with the Antenna Beam against General Blue and consuming a vehicle. In Dragon Ball Super, both Gatchans devour an entire building in West City. The film Dragon Ball: Mystical Adventure features Gatchan deploying the Antenna Beam against General Tao. Video game appearances include Dragon Ball Z: Budokai Tenkaichi 3 and J-Stars Victory Vs., utilizing the Antenna Beam in combat. A live-action GU clothing commercial depicts Gatchan flying among other Dr. Slump characters. The character also appears in the film Dr. Slump & Arale-chan Ncha! Wakuwaku Hot Natsu Yasumi (1994), involving a summer resort conflict with a vampire antagonist. Conceptually, Akira Toriyama created Gatchan to add a pet-like companion to the Norimaki household, repurposing elements from his rejected manga concept, Ageha Town Observation Diary.