Koroppi Hasunoue is a supporting character in the anime Kero Kero Keroppi no Christmas Eve no Okurimono. He is the youngest of the Hasunoue triplets, the other two being his brother Keroppi and his sister Pikki. The family lives in the Donut Pond area, where their father works as a doctor and their mother runs a restaurant. In this Christmas special, Koroppi is part of the close-knit circle of friends and family that surrounds Keroppi. The story follows Keroppi as he helps a fallen star regain its confidence, and Koroppi appears alongside the other residents of Donut Pond, contributing to the community atmosphere. Koroppi is frequently mistaken for Keroppi, which emphasizes the strong physical resemblance between the two frog brothers. His individual personality and motivations are not explored in great depth in this particular feature compared to Keroppi, but his role as a supportive younger sibling is established. No notable unique abilities or substantial personal development are specifically highlighted for Koroppi in this story; instead, his presence reinforces the themes of friendship and family cooperation central to the OVA.