Dora is Taisho and Shosho's pet cat. He possesses considerable size and physical strength, his sturdy build allowing Shosho to ride comfortably on his back—a consistent trait in all portrayals.

Primarily a companion, Dora accompanies Taisho and Shosho during their activities and schemes. He is often present during their mischief or conflicts, though typically as a passive participant rather than an instigator.

A recurring element in anime adaptations depicts Dora pursuing a romantic interest in Shippona, Akko's cat. This subplot unfolds through various interactions and scenarios, adding lighthearted moments. This romantic angle, however, is absent in the manga continuity.

Dora's design and narrative role show variation across media. He appears infrequently in the second Ribon manga run and Nakayoshi serialization, mainly as a background element accompanying the brothers without significant plot involvement. Later adaptations, like the web manga "Himitsu no Akko-Chan μ," omit the character entirely.

Animated iterations maintain Dora as a consistent presence. His role centers on providing occasional comedic moments through interactions with Shippona or supporting the brothers' antics, without major developmental arcs, backstory expansions, or influence on broader storylines.