Peggy

Peggy is a Chimera Ant Officer resembling a macaroni penguin.

Chimera Ant arc
In his human life, Peggy was the foster parent of Meleoron. He is likely the most knowledgeable among the squadron leaders, having shown his knowledge in reading and deducing the weapons the humans used were guns. He is never seen involved in a proper fight. Peggy is immediately killed by Meruem, the Chimera Ant King, after worrying about saving the Chimera Ant Queen's life. His sudden death causes Meleoron to regain some fragments of memory of his human life and turn traitor in order to avenge Peggy's death.