Tapper appears across multiple adaptations with consistent core traits and narrative function. In the original book series, he is an overweight goat within the Sawasawa Mountains herd, serving as an older brother figure to Mei by providing guidance and support. This fraternal dynamic defines his character interactions.

The anime film adaptation maintains Tapper's role as Mei's supportive companion within the goat community, though his physical description receives less emphasis. His concern about Mei's unconventional friendship with Gabu aligns with his book portrayal.

Significant expansion occurs in the television series *Arashi no Yoru ni: Himitsu no Tomodachi*. Here, Tapper undergoes a redesign, shifting from overweight to a more fit physique. A persistent romantic subplot emerges, depicting Tapper harboring feelings for Mei and repeatedly attempting to confess them. These attempts are consistently interrupted by external circumstances, creating recurring comedic and narrative tension. Despite this, his underlying loyalty and protective instincts toward Mei remain consistent with his original fraternal role.

Across all media, Tapper is consistently associated with Mei's goat herd in the Sawasawa Mountains. His narrative function centers on representing conventional herd perspectives while demonstrating personal concern for Mei's wellbeing, framed through either familial bonds or unexpressed romantic interest. Documented appearances remain limited to the core series, film, and television adaptation.