Big Joe is a supporting character in the anime, recognized for his large and powerful physique. He is the father of Bill, one of the main character Jeanie MacDowell's two closest childhood friends. Big Joe is employed by the MacDowell family, for whom he handles a variety of physical tasks including farm work and house repairs, relying on his notable strength to complete these duties.

In terms of personality, Big Joe embodies the archetype of a gentle giant. Despite his extremely bulky and strong appearance, which makes him well-suited for his demanding job, he is consistently kind and gentle, particularly towards his son Bill and Jeanie. His nature stands in contrast to his son's interests; Bill greatly admires and idolizes his father for his physical strength, even though Bill himself is more inclined toward music and has not inherited his father's muscular build.

Big Joe’s role in the story is primarily defined by his relationship with his son and his position as a trusted employee of the MacDowell household. He is known to everyone by his nickname, "Big Joe," and his presence in the narrative contributes to the depiction of the tightly-knit community in which the main characters grow up. Information regarding specific story arcs, personal development, or any notable abilities beyond his physical strength is not available.