Frisk

Frisk is the playable character who also serves as the main protagonist of Undertale. After falling into the Underground, Frisk embarks on a journey to return to the Surface. Frisk is the last of the eight humans to fall into the Underground after traveling to Mount Ebott.

Trivia

 * Kushowa did say about Frisk's name. Even he did not do True Pacifist Route yet.