Papa, also referred to as Sandy's dad, is the father of Sandy, the main character of The Marshmallow Times. He lives with his family in an apartment in Marshmallow Town, together with his wife, who is called Mama, his twin sons Choco and Mint, and later the talking sheep-like creature Cloud, who joins the household. Papa works as a company employee, and his role as a working parent is a notable part of the family's everyday life. One episode of the anime is centered on the possibility that he may be laid off, a situation that places his job and the family's stability at the center of the story.

In appearance, Papa has a mustache but a face described as somewhat childlike. He wears glasses, a trait shared by members of his family. His personality is easygoing and slightly absent-minded, yet he is very kind. He is especially fond of playing with toys and retains a playful, youthful outlook. This childlike quality is not only a personal trait but also part of what makes him effective in his work as a company employee, as his imaginative and playful approach proves useful on the job.

Papa's main role in the story is as a gentle and supportive father within the household. His relationship with his wife is close, and Mama is deeply devoted to him and reacts strongly if anyone speaks ill of him. He is also a caring parent to Sandy and to the twins Choco and Mint, and he accepts the unusual presence of Cloud in the family home as part of daily life. The warmth of the family environment around him forms the domestic backdrop for the series, and his quiet, good-natured presence balances the more energetic personalities of the children. His storyline involving the risk of losing his job shows the family's concern for him and highlights his importance as both a breadwinner and a beloved member of the household.