There is even a mini-game where you choose one of the characters and have him do a mini scene for you in-game. It is also a great way to learn the basics of playing the different characters in the game and to familiarize yourself with the different controls and skills used by the characters in the game.
The Undertale: Undertale Together Mod adds a lot more content than the main game. The Undertale: Undertale Together Mod combines the hit visual novel, Undertale, with the classic gaming theme of co-op play.