Ralph Walnut belongs to the Walnut Squirrel Family, introduced with the toy line in Japan during 2004 and in the UK during 2005. He possesses exceptional tree-climbing skills, claiming to have scaled every tree in Sylvanian Village. This ability proves crucial when he retrieves his younger brother Ambrose's balloon from a tall tree. He celebrates his birthday on August 22nd.

Within the *Sylvanian Families: Mini Story* animated series, Ralph features in multiple seasons. His debut occurs in Season 1, Episode 2, "Secret Tree House Tour!", during a tree house exploration event. Season 2, Episode 7, "Following my brother," centers on his relationship with Ambrose, highlighting his role as an older sibling. Ralph also appears in Season 4, Episode 4, "The Horror Night."

Ralph shares a close friendship with Freya Chocolate and Lyra Persian. An official storybook shows them collaborating on a surprise involving many balloons for Freya’s birthday. When Ralph and Lyra are absent during the celebration, Freya searches for them, leading to an incident where the balloons carry her airborne. Ralph and Lyra ultimately help resolve the situation.

His documented appearances remain within the *Mini Story* series and the specified storybook.