Grandpa is a character that only appears at the very beginning of Samus and Joey. The grandfather of Joey Apronika, he works to maintain a windmill on Liberty and may have been Joey's caretaker after the death of his father and departure of his mother. Like with the other villagers on Liberty (except for Joey), Grandpa is not skilled in combat and very worried about Joey getting into dangerous situations. Joey wishes to become strong so he can protect his Grandpa.
During the Space Pirate invasion of Liberty, Grandpa constantly worries about Joey, but his fears are assuaged when he and Samus Aran cause the dormant Mount Pagos to erupt, killing the Megaroids. As Samus is leaving, Joey desires to accompany her. Grandpa is against this idea, but Joey goes along with her and later becomes her trusted partner. He offers Joey a box of "prized" prunes as a parting gift, which he humorously declines.