After all, he goes through a whole elaborate act to make Alphys look good for Frisk as he plays the evil robot set on killing the human. This does have some selfish reasons to it as this also helps his ratings for his show, but he does it out of his sense of loyalty for her. She did make him the body he always dreamed about and in her room is actually a signed poster from him thanking her. There's a sense of gratitude to her and in multiple routes of this game, he shows this loyalty to her. In the no mercy run, he stays behind to try to buy her more time from being killed by the human and it's actually at this part of the game you can stop a no mercy run and make it neutral. Mettaton actually tries to make you go neutral. And in the ending where he becomes ruler, amongst all the statues of himself he builds one for Alphys because he states he doesn't think he was very good to her. Mettaton isn't all about himself all the time, even if he does actually drop the act to go ahead with his own plan to become a star on the surface. To Mettaton, it's better he does this than to have another war amongst humans and monsters break out. Remember, Mettaton actually made a fan club to humans when he was a ghost. He doesn't want to see anymore humans or monsters die. It's a pointless
After all, he goes through a whole elaborate act to make Alphys look good for Frisk as he plays the evil robot set on killing the human. This does have some selfish reasons to it as this also helps his ratings for his show, but he does it out of his sense of loyalty for her. She did make him the body he always dreamed about and in her room is actually a signed poster from him thanking her. There's a sense of gratitude to her and in multiple routes of this game, he shows this loyalty to her. In the no mercy run, he stays behind to try to buy her more time from being killed by the human and it's actually at this part of the game you can stop a no mercy run and make it neutral. Mettaton actually tries to make you go neutral. And in the ending where he becomes ruler, amongst all the statues of himself he builds one for Alphys because he states he doesn't think he was very good to her. Mettaton isn't all about himself all the time, even if he does actually drop the act to go ahead with his own plan to become a star on the surface. To Mettaton, it's better he does this than to have another war amongst humans and monsters break out. Remember, Mettaton actually made a fan club to humans when he was a ghost. He doesn't want to see anymore humans or monsters die. It's a pointless