Mettaton (Undertale Film)

Mettaton is a character in the Undertale 2025 film. He is a robot with a soul and was built by Alphys. Initially poised as an entertainment robot turned human killing robot, Mettaton is later revealed to have only acted as such so that Alphys could rescue Frisk, feel important and become closer to her. Mettaton is the sole television star of the Underground.

Appearance
Mettaton originally appears as a gray, largely rectangular box with a 4x5 grid of rectangular lights at the top, similar to the mechanism in Snowdin Forest used for Papyrus' Tile Puzzle. The grid of lights can change colors between red, yellow, green, and blue, and Mettaton uses these color changes in place of facial expressions. He has four dials along the bottom of his body, and the bottom, he has a single leg which ends in a wheel. He has two segmented robotic arms which end in white gloves.

After having the switch on his back flipped, Mettaton transforms into Mettaton EX; a new body he specially requested Alphys make for him. In this humanoid form, he has black hair with a long fringe that seems to cover his right eye, pale "skin" and visible metal segments below and above his left eye.

He has a pink chest piece, a narrow metallic waist with a box contraption, and black shoulder pads above his segmented arms, which end in gloves. The chest piece has what appear to be a speaker and some knob or gauge, while the waist has two parts that seem to act as a locking mechanism that holds his "heart-shaped core,". His long black-clad legs end in pink high-heeled boots.

Personality
Mettaton is a confident, charismatic, and charming TV host that loves drama, action, and violence. He lives for his ratings and adores performing. He supposedly strikes a pose when he does something wrong and makes time on his various shows to beat up "heel-turning villains." He shows a rather shallow appreciation for existence at times. He has a strong craving for attention and is very egotistical for the point of narcissism, such as boasting about the beauty of his true form. However, despite his seemingly narcissistic personality, he deeply cares about the seemingly positive impact his show has had on the inhabitants of the Underground. He has also shown soft spots for several characters, such as Alphys and Napstablook. He also appears to be among the fewer characters in the Underground that has no hate or prejudice against humans despite knowing about the monsters' history with them, since his initial attempts to kill Frisk were just him playing along with Alphys's plan, and he outright tells Frisk he has no desire to hurt humans and is far more interested in simply entertaining. While he did attempt to kill Frisk, it was to prevent Asgore from taking her soul and be seen as a hero/savior to humankind, further emphasizing his lack of prejudice. On the flip side, he has also been noted to be a very demanding boss who is very unpleasant to work for, especially according to Burgerpants, who initially considered working for him a dream, but has since grown to strongly despise him.

Abilities
Mettaton can do many things thanks to his robotic body. He can fire electricity out of his finger, summon small versions of himself with parasols, transform disco balls into laser weapons, and various other things based on robotics. In his original form, he is immune to all forms of damage, including shots from Frisk's yellow soul powers. He loses this invincibility in his EX form.