"Go in peace!"
—Turtle, Inkwell Isle 3
Pacifist Turtle is an NPC in Cuphead. He is a little green sea turtle that sits around in the piers in Inkwell Isle 3. When talked to, he tells Cuphead about a black and white world with pacifism, which is a hint of his sidequest.
If the player doesn't kill any of the enemies in the Run n' Gun levels, the turtle will unlock the black and white filter for the game.