Afu combines sharp intellect with a playful trickster streak, executing calculated pranks against puchidols and humans alike. This rice-obsessed prankster harbors a voracious appetite for onigiri, frequently sparring with Miki over coveted rice balls. Despite its chaotic energy, Afu sleeps deeply, undisturbed by loud disturbances. The character routinely provokes Chihya through pointed comparisons about physical proportions, flaunting perceived advantages in bust size to spark friction.

Summer triggers a seasonal metamorphosis: blond hair darkens to brown while its ahoge curls into a heart shape. Warm-weather shifts awaken heightened romantic inclinations, manifesting intensified attraction toward males and androgynous figures like Makoto, accompanied by clingy tendencies. Vocal patterns shift accordingly—standard exclamations of "Afu!" and "Na no!" give way to breathless "Hanii!" declarations.

Afu’s compact stature serves as the unofficial metric among puchidols, though the inclusion of its signature ahoge in measurements remains ambiguous. Originally discovered and christened by Ami, Afu debuts in Chapter 1 of the manga. Cross-media portrayals reinforce habits like stealing meals, orchestrating office chaos, and employing strategic ploys like the Wounded Gazelle Gambit to sidestep reprimands.

Anime adaptations depict summer transformations amplifying romantic pursuits, marked by persistent physical overtures toward subjects of interest. The character maintains visual and behavioral continuity across manga, anime, and gaming platforms, with no documented variations in backstory or evolution across iterations.