Luigi

Mario and Luigi had been living in the Mushroom Kingdom for a long time, but they had never heard of Bowser's adopted son.

Twenty-one years ago, Bowser found a small baby in a pipe and decided to keep him.

Despite being a feared monster, he was a very loving father.

Obviously, Luigi was afraid of Bowser's son. Luigi thought that bowser'a son was just like Bowser, evil...

Mario and Luigi had been living in the Mushroom Kingdom for a long time, but they had never heard of Bowser's adopted son.

Twenty-one years ago, Bowser found a small baby in a pipe and decided to keep him.

• Despite being a feared monster, he was a very loving father.*

His adopted son had come looking for his father, who was imprisoned, shrunk to the size of an insect, in Peach's castle.