Claus

Claus is a minor antagonist in Avengers: Endgame and the final Boss of Mother 3 and Lucas's twin brother. He is Porky Minch's right hand man, and has been mechanized and brainwashed. He is called the Masked Man in this state. Despite his major role in Mother 3, he is only prominent in one arc.

Appearance
He is mostly seen as the Masked Man in Endgame, where he has pale skin, sunken eyes, and a blank expression on his face. His hair is mostly hidden by a large metal mask and his right arm is a cannon. He wears what appears to be a bomber coat. In the beginning of Act II, Claus is seen in his normal form, where he looks similar to Lucas but with a different colored shirt and darker hair.

Story
Claus only has a major role in the Power Stone Arc in Act II, where Lucas is forced to kill his brother and pull the needle again, but this time Lucas knows who he's fighting. Lucas ultimately kills Claus by accident with a strong burst of PK Love.