Shellshock

Shellshock is the leader of the Shellshockers, and a character in Paper Mario: The Thousand-Year Door. Shellshock is a Shady Koopa who is fought in the Major League of the Glitz Pit. He has a similar personality to that of King K., and is shown to have some kind traits. During the game, if the player refuses to eat the second cake given to Mario, Shellshock will eat it; after Mario and his partner return from their battle, they find Shellshock lying on the floor in a somewhat-paralyzed state, due to him being poisoned from the cake.

Shellshock also plays a fairly notable role during the final battle with the Shadow Queen. A cinema showing members of the Glitz Pit giving Mario support in the battle show what appears to be Shellshock giving some encouraging words to Mario. However, it is often speculated that this Koopa was meant to be King K., but a Shady Koopa was used in place of the appropriate K.P. Koopa sprite.