Alter Ego is a major antagonist of LarryBoy: The Cartoon Adventures episode, Leggo My Ego!.
LarryBoy in that episode is so egotistical that he believes that being a superhero is being better than others, so Alchemist made him smells a flower with chemicals that can shrink the ones LarryBoy looked down on. Alter Ego is created by Alchemist out of LarryBoy's egotism. Once LarryBoy boasted more, Alter Ego grows, but then LarryBoy humbled himself. Alter Ego shrunken and disappeared. The shrunken people of Bumblyburg who got captured because of LarryBoy's pride got back to normal sized because of his humility.
Alter Ego is the giant version of Larryboy with reversed colors. His mask, cape and pants are green instead of purple, his skin is purple instead of green, his suction ears are black instead of red and his suit is red instead of yellow.
Alter Ego is a mindless monster who is very brutish to Larryboy. He wanted to fight someone smaller and weaker, likely because he is made of LarryBoy's egotism. He is hungry for that, so that he will expand.
VeggieTales in the House