One Piece: I'm the Straw Hat Pirates' Strategist

【System + passion + comedy = no heroine?】 Now that I've become the strategist of the Straw Hat Pirates, Ace obviously has to be saved, Momonosuke absolutely has to die. But I'm just a strategist, okay? Yet I'm a master of the Six Powers, have all Three Types of Haki, and unexpectedly gained the Human-Human Fruit, Mythical Zoan, Kirin Child form. I'm the Straw Hat Pirates' strategist in public, their nanny in secret, their training coach, and their master of snark... (The first forty chapters move at a slower pace. Stick with it if you like it; after that, it's fireworks all the way.)