Mr. Poolcheck

 is the head lifeguard at the Gravity Falls Pool.

History
At an unknown time, he lost his right hand in a pool filter, and has since replaced it with a prosthetic. Since the incident, he no longer underestimates the dangers of a pool.

Poolcheck is first seen in Dipper's story in "Bottomless Pit!" sitting at the Skull Fracture bar. When the bouncer calls for an arms against Dipper (for being a prank caller), he joins in the chase along with the rest of the bar's occupants.

In his official introduction in "The Deep End," he is Wendy's boss at the Gravity Falls Pool and later agrees to hire on Dipper. At first he takes a liking to Dipper, but comes to realize both Wendy and Dipper do not take the job of lifeguard seriously enough. Near the conclusion of the episode, he fires both Wendy (not seen) and Dipper.

Personality
A very intense man who takes life guarding very seriously, yet he is still quite willing to give anyone a chance. He seems to get angry and has a short-temper when things don't go well and always wants the pool's best interest's at heart.

Appearance
Poolcheck is a tall, muscular man with sharp features. A square jaw, prominent cheek bones, and has short blonde hair with a receding hair line, He wears the typical lifeguard's bright red, button up shirt, white shorts with tennis shoes, and a dab of sun lotion on his nose.

Trivia

 * His name is a pun on "pool check" as the pool's lifeguard.