Saburo is first encountered in the Sunken Ship, in the room with the large pile of bones, alongside Jiro, as always. Saburo is a hermit crab, like Jiro, but its shell is the armored tail of a shark, which is also razor-tipped on the edges that allows Saburo to rapidly swing the tail horizontally in a windmill-like fashion for slashing its opponents. Also, in battle, Saburo will be constantly attempting to dig through the ground of the area, flooding it with water and allows it to reunite with Jiro into the mighty Ichiro, Saburo being the tail of the demonic shark.
Saburo and Jiro were originally a human couple who was prepared for engagement, but their marriage was opposed by both families. Having no other choices to stay together forever, they plunged themselves down to the sea, but their spirits remained and was separated. Now Saburo, filled with sorrow, constantly attempts to dig holes to flood areas with water, in an attempt to be able to reunite with its lost partner Jiro, and stay together forever.
"Sad Saburo digs holes to reunite with its partner, Jiro
It believes that by digging to let water in, the two can be together in the sea.
Variations on the Saburo legend exist, especially in seaside villages."