Kuina
She was weak.
Or so she had it stuck in her head, as a girl, a female.
Someone who could never surpass a man, ignoring her rival, who tried desperately to convince her else, until the night when she beat him, when she beat him for the 2001st time. She felt happy, happier than ever before as she walked to the storage area, not even minding that she now had to sharpen her sword after her fight with him. So when she tripped, she realized what would happen. That she could not avoid it. Which she couldn't, and so she accepted her fate smiling, proven by her friend that a woman could indeed become a great swordsman.
Her last thought was:
Thank you, Zoro.
She was found soon later. She died of a broken neck after falling down the stairs to the storage area.
And years later, a green-haired man thinks back to when he was young. His hand brushes against his most treasured item, a white sword he received many years later. His hand catches on to a small piece of the hilt, opening a small compartment he had never seen before. Inside was a small slip of paper. On the paper were the words:
Zoro, is you find this, that probably means that I am now dead. I just want to thank you. You convinced me that being a woman does not mean that I can't become a great swordsman. If I am dead, I also want to tell you as a last word, these were the words in my mind when I died. I would be shamed if I didn't die with them burning through me.
Thank you, Zoro.
And the green-haired man is found hours later by his captain, who quietly walks away from the sleeping first-mate, his tears still drying on his cheeks.