Ralph Walnut is a member of the Walnut Squirrel family, known for his energetic personality and remarkable tree-climbing skills. He claims to have scaled every tree in Sylvanian Village, though this assertion remains unverified. His agility is evident when he swiftly retrieves his younger brother Ambrose's balloon from a tall tree. Ralph frequently embarks on imaginative adventures with friends. Inspired by an adventure story, he expressed a desire for similar escapades, leading his father Cedric to build a tree house playground. Ralph enthusiastically explored this new structure, pretending to be a wizard and leading other children in play. During a seaside holiday, he interpreted a pile of glittering seashells discovered behind a rock as treasure brought by a shooting star, demonstrating his sense of wonder; this sparked excitement among younger children, though the shells were actually collected by Freya Chocolate.

His family identifies him as the brother in the Walnut Squirrel household. His father is Cedric Walnut, a carpenter known for inventive creations; his mother is Yardley Walnut, noted for her sociable nature. He has a younger brother, Ambrose Walnut, and a sister, Saffron Walnut, who collects yellow objects. Ralph's birthday is August 22nd. He appears in the upcoming feature-length film "Sylvanian Families the Movie: A Gift from Freya," with specific details about his role undisclosed beyond his inclusion in the cast.