Agehaguera

The Agehaguera (アゲハグエラ ) is a creature developed by Dr. Indigo using the chemical SIQ for Shiki's plot to use monstrous creatures to attack East Blue to force the World Government to submit to him.

It's a giant colorful butterfly, that is mostly always seen smiling. As it moves its wings, the Agehaguera releases toxic pollen that can weaken its enemies.

It appeared in One Piece Film: Strong World when the creatures from all over Merveille invade Shiki's palace, but it was quickly defeated by Robin.