Roronoa Zoro as a kid is a determined young 9 year old swordsman in training from One Piece. He has short messy green hair, sharp eyes, a bandana, and an athletic, muscular build for his age, often covered in bandages and scars from intense training. He usually wears simple training clothes. Fiercely competitive, stubborn, and hardworking, he trains relentlessly with three swords to become the world's greatest swordsman and fulfill his promise to Kuina.

Shimotsuki Kuina is a talented young 11 year old swordswoman from One Piece. She has short shoulder length straight black hair with bangs, sharp dark eyes, and a slender athletic build, usually wearing a simple white gi. Competitive, proud, and hardworking, she dreams of becoming the world's greatest swordsman but harbors insecurity about her gender holding her back. She remains honorable and inspiring to Zoro.

Shimotsuki Koushirou, known as Shimotsuki Sensei, is Zoro and Kuina’s swordsmanship teacher and dojo master in One Piece. He has long black hair tied in a ponytail, a wrinkled face, round glasses, and wears a gray yukata often with a beige haori. Calm, wise, and disciplined, he is an honorable sensei who believes in using swords to protect rather than kill, though he holds traditional views on gender and strength.