Satchi is the sixth-born of seven mouse siblings living with their parents. Often grouped among the younger siblings, Satchi is distinguished by a blue coloring, typically present on the head or clothing. Satchi participates alongside the siblings in the family's daily adventures, which include exploring their surroundings, solving simple problems, and learning about the world. Satchi's role remains consistently part of the collective younger sibling group within the family unit throughout the depicted stories.