Aina possesses long auburn hair, styled with most bangs brushed sideways and a portion held back, featuring a distinctive curled ahoge atop her head. Her large, round eyes are light brown.

She acts as the kind and thoughtful leader of her group, characterized by a soft, gentle demeanor. This often leads her to yield to other members' eccentricities. While frequently bewildered by their unconventional behaviors, she consistently shows affection toward them.

Her name, "Aina" (あいな), is written in hiragana. When rendered in kanji (愛菜), it combines the characters for "love, affection" (愛) and "vegetables, greens" (菜), though this represents a possible interpretation.