Mettaton Fell

In its basic form, the Mettaton looks like a curved metal box. He has two hands: the left in a red glove, the right in a yellow one. There are also black shoulder pads, three dials and a shackle at the bottom of the case.

In his "FORMER" (humanoid) form, he takes on a more sinister appearance: greasy black hair, two pairs of eyes, pointed hips, latex boots, cracked red chest, and a mouth stretched into a menacing smile. His distinctive feature is two pairs of hands: the first in red latex gloves, the second in yellow laboratory gloves, which are remotely controlled by Alphys.

After completing the "Trust Route", his appearance becomes closer to the version from Undertale: he retains two pairs of eyes, but turns dark purple instead of red, his mouth is no longer stretched into a smile, and he has only one pair of hands left.

As in the original game, Mettaton is a robot with a soul, created by Alphys to entertain the inhabitants of the Dungeon. However, in Underfell, his image changes dramatically: he becomes a violent showman who seeks to monetize and promote Frisk's demise through his TV show.

At first, he may act friendly towards the protagonist, but later tries to betray him. In the final battle, he transforms into the Mettaton GAMMA form and brings it to maximum power to ensure victory for the sake of ratings.

If the fight ends without bloodshed, Mettaton realizes that the public no longer craves violence, and he can become a star in his own way. But before he can say goodbye to the audience, Alphys ties his limbs and tears him apart.