I’m the Uncrowned Queen in One Piece

After Gu Zi'an transmigrates as Ace's older sister, she works tirelessly. Having awakened Conqueror's Haki at birth, she lives at Marine Headquarters with Garp until the age of twelve, and is often looked after by the Three Admirals as a child. Her relationships with the Three Admirals are rather ambiguous. The murderous aura she carried from her past life, where she killed far too many people, gains a mind of its own and stays by her side.

She grows stronger and stronger, all so Ace will have more chances to live on.

There are also ambiguous feelings between her and Marco, Doflamingo, Shanks, and others…