Ginkotsu

was a member of the Shichinintai and was Renkotsu's assumed best friend, since the two are hardly ever apart. Renkotsu built Ginkotsu's mechanical body and kept it running throughout the time that Ginkotsu had it before it was blown up by Inuyasha. Renkotsu then rebuilt Ginkotsu's tank body in a cave with a whole new variety of weapons, making Ginkotsu a walking arsenal.

Ginkotsu seems to be loyal to Bankotsu and Renkotsu, which would cause problems were he able to talk, but he is sadly limited to only a small "gersh" after his dangerous encounter with Inuyasha. He also provides transportation to the group by being able to roll on gigantic wheels. He generally does not move very quickly, but he could outrun an enemy any time.

Destruction/Death
In the manga, Ginkotsu is destroyed when Koga stuffs armor in his cannons, which causes them to backfire and blow his mechanical body to pieces. However, in the anime,the same thing happens but fails.He later then self-destructs to protect Renkotsu after Koga hurts him and after all of his other attacks fail to work. Also, he gives Renkotsu his jewel shard to defend him with a barrier.

Weapons
Original Body: In his original body Ginkotsu has five razor sharp saw-like gears on his back that could be fired(Which was activated by the right cord on his chest.) and controlled, that are connected steel razor-wires(that could be left behind) that were used to cut/bind enemies.

A cannon attached to his back/left shoulder(which was operated the cords on his chest), that could fire either a simple explosive-cannonball, or fires an object that release a large number missiles to destroy a large area.

A left robotic arm with a grappling claw which could be shot to grab enemies at a distance and slamming them onto the hard terrain.

A sword he kept at his waist, but rarely used, generally when an opponent got to close for him to use his other weapons. A set of of arrow tipped wires(which were thicker and stronger than the ones used with the saws, which were located underneath his shoulder guards).

An Ax & Chain, he might have used these is he was out of ammo or his opponent got too close, however he uses it to 'grab' Tetsusaiga to keep Inuyasha from attacking Renkotsu.

A Telescopic Drill in his chest.

Trivia
His tattoo means Protection, referring to his tank like body.