Well, after the 1.001 update there is a hint that his special attack might involve Gaster Blaster. You can watch it on YouTube: https://www.youtube.com/watch?v=6aje8v4zl0Y

2016年3月16日 · I’m not against Papyrus using Gaster Blasters, but I don’t think they’d be his special attack since Sans uses them as a normal attack and basically doesn’t have a special attack (he literally said his special attack is nothing and is never gonna be anything either).

2016年7月11日 · In case nobody remembers, the Annoying Dog had the special attack in it's mouth, and it was a bone, not a Gaster Blaster.

If the Genocide Route is aborted by sparing Papyrus and the protagonist interacts with his box of bones, Papyrus says that if he had used his "special attack," he would have "blasted" the protagonist away, but suddenly realizes that he can't find it.

Gaster Blaster — jest to jeden z ataków Sansa podczas walki z nim na ludobójczej ścieżce. Gaster Blaster został wynaleziony prawdopobniej przez W. D. Gastera. W. D. Gaster stworzył je prawdopodobnie do zniszczenia bariery. To że Sans używa ich w Genocide tylko potwierdza że on i Papyrus są…

The Gaster Blaster's firing animation. Sans and Papyrus 's bones have different sprites; Sans has more rounded attacks, while Papyrus's are flatter on the top and bottom. The sound of Sans's Gaster Blasters consists of two sounds used by Asriel .

While Papyrus's "special attack" is shown as a bone during his battle, it is possibly implied that the attack somehow involved a Gaster Blaster. Papyrus's pose is likely to be a reference to ancient Egyptian drawings that resemble his stance.

While Papyrus's "special attack" is shown as a bone during his battle, it is possibly implied that the attack somehow involved a Gaster Blaster. [51] Papyrus following the protagonist as they walk in and out of the kitchen.

2016年5月31日 · I personally support the theory that Sans and Paps are Gaster's sons for a few reasons. Gaster seems to be the only skeleton, or skeleton-esque entity in Undertale. Also, Sans does seems to have connections of some kind with the G, not to mention his liberal usage of Gaster Blasters.

The Gaster Blaster is used as the Mii Gunner's arm cannon. The Sans Mii Costume and MEGALOVANIA remix can be bought for $0.75 (for North America, other regions vary). The costume model is similar to the 3D model used for the "Sans Inaction Figure" sold on Fangamer, though it differs with the aforementioned Gaster Blaster and no visible neck.