Ralph Walnut is a squirrel belonging to the Walnut Squirrel family. He bursts with energy and possesses exceptional tree-climbing skill. This ability is showcased when he swiftly retrieves a balloon stuck high in a tree for his younger brother Ambrose, illustrating both his agility and his role as an older sibling. Ralph boasts of having climbed every tree in Sylvanian Village, though others have not confirmed this claim.

Within his family, Ralph is brother to Saffron Walnut and the older brother of Ambrose Walnut. His father is Cedric Walnut, a carpenter and inventor, and his mother is Yardley Walnut. Ralph helps his father in the carpentry workshop, working with the various tools and machines there.

Ambrose Walnut, the youngest sibling, admires Ralph's climbing prowess and dreams of matching his older brother's skill. Ambrose currently prefers jumping in puddles and getting muddy.

Available sources provide no details on Ralph Walnut's physical appearance, character development, or specific storylines within the "Sylvanian Families Freya no Go for Dream!" anime series or any related films, OVAs, spin-offs, or other official animated media.