Clam Guy
O, k, k, k, k...
I was thirsty, so I came over from Waterfall to get a drink!Clam Guy
Clam Guy[1][note 1] is a minor character in Undertale. They appear near the entrance to Hotland on floor 1.
Clam Guy is a monster sporting a clamshell-shaped head. The clamshell is primarily purple, with light blue markings across the top. They appear to wear a light blue outfit that covers most of their body and leaves the collar exposed.
Clam Guy's clamshell is initially closed, but it opens up when speaking to them, revealing their face. Additionally, they raise their arms, which are otherwise crossed. Clam Guy's face is round purple, with what appears to be a green crown on top. They sport a toothy grin and appear to wear black sunglasses. They bear a strong resemblance to Clam Girl.
Clam Guy has a habit of repeating the letter "k" (as in, "O, k, k, k, k...) whenever they speak. They are fixated on water, but they accuse the protagonist of acting sophisticated if they attempt to bring water to them. Clam Guy comments on the situation regarding the nearby water cooler depending on how much water the protagonist dumps onto the ground.
Clam Guy appears in the water cooler area after leaving and returning. They talk about how they came to Hotland from Waterfall specifically to get a drink. They comment if the protagonist carries a glass of water[2] and if they dump a few glasses of, or all of the water on the ground.[3][4] If the protagonist pours all of the water out of the cooler and drops it, they talk about how there is now a "private pool" and say worse things have happened.[4]
During the True Pacifist Route epilogue, they plan to have a nice drink on the surface.[5]

Originally, Clam Guy was supposed to be a fish-like or octopus-like monster similar to Onionsan.
In Deltarune, Clam Guy makes an appearance in Hometown's lake path, commenting on Onion's appearance. The Deltarune version of Clam Guy shares their idle sprite with Undertale's Clam Girl, changing to their normal hue and sprites only when speaking.
- ↑ Sprite name is
spr_clamguy. Object name isobj_clamguy.