Sheldon

Sheldon is one of the friends.

Appearance
Sheldon has brown eyes and buck teeth, and because he is a horseshoe crab, his helmet is the shell of that species of chelicerate. Sheldon wears a military jacket and boots, as well as a red scarf and a red belt. Sheldon also has what appears to be brass binoculars that he seems to use as glasses.

Personality
Sheldon is a military fanatic from a well-respected family who is fascinated with his weapons. When talking to Sheldon inside his shop, if the player has unlocked any new weapons, he enthusiastically explains all about them in great detail. He has developed nearsightedness due to staying up late every night tinkering with weapons and small parts, causing him to be rejected from the military for his extremely poor eyesight. Undaunted, he decided to start a business selling weapons out of his own home, and Booyah Base was eventually built on the same land upon which that home stood. However, it was not Sheldon but his grandfather, Ammoses Shellendorf, who owned the land. In Splatoon 2, he seems to have improved his skills in creating weapons as he is now able to create new versions of the Hero weapons as well as upgrade them with a machine he made as well. When the Hero Replicas are available to be purchased, instead of saying he could not replicate the technology like in the first game, he says that the weapon was not able to be mass-produced by "the guys at the factory".

Sheldon's version of DJ Lee Fish's song Lookin' Fresh is more distant, showing his separation from the others as a weapons dealer. It also has static and other sounds reminiscent of a military radio, as a reference to his obsession with the military.

In the show, he likes swimming, spinning, and conducting his band.