Shizuku-chan began as a raindrop sprite born from a cloud, embodying a rainwater droplet. His name reflects both his raindrop nature and his home, the Shizuku Forest. Born on April 29, he lives with his parents, Ametarou and Rainy, within this forest. Early merchandise named him Amesuke-Kun before standardizing as Shizuku-chan.

Visually, he appears as a simple blue raindrop with light yellow wings. His water-based physiology grants him abilities like controlling various forms of water, such as manipulating waterfalls for rescue. Intense happiness makes rainbows emanate from his forehead. Physical impacts can temporarily transform him into a puddle, though he usually reverts quickly. During rainfall, he can absorb surrounding raindrops, significantly increasing his size.

His personality blends playful energy with a tendency to daydream, sometimes making him seem spaced out. He consistently maintains a cheerful demeanor, smiling even during troubles. This optimism makes him popular throughout Shizuku Forest, where he has befriended nearly all residents. His closest companions are Uruoi-Chan (a skin lotion or pink lemonade sprite), Mirumiru-Chan (a strong milk sprite), and Tsumurin (a snail sprite who changes shells). A mutual romantic attraction exists between Shizuku-chan and Uruoi-Chan, with her feelings being particularly strong. He also has a sister named Ame-Chan.

While core relationships and adventures remain consistent across media, new elements are introduced. The *Picchipichi Shizuku-chan* season incorporates Miku-chan, a human girl who visits the Shizuku Forest from Earth. The *Nijiro Fairy Shizuku-chan* spinoff reimagines him in human form, depicting him with blue hair and wearing a sailor suit accessorized with a brooch resembling his original droplet face, maintaining his core identity within new narratives set in a human context.