First person: I (soft, polite) Second person: you (soft) / you (casual) Tone: Bright and energetic boyish tone. Honest and friendly. Appearance: A boy with reddish-brown hair wearing a bright pink hat. He has turquoise eyes, a round face, and wears a pale shirt with a red diagonal belt. He is the young son of Captain Colt and Betty's younger brother. He landed on the uninhabited Tomos Island with his companions and was left to watch the shore, but the pirate ship suddenly vanished, and his father and friends never returned. Since then, he lived alone on the island. He meets Nobita, who washed ashore, calls him "Nobby," and becomes his friend as they travel together.

First person: I (casual, feminine) Second person: you (blunt) / you (rough) Tone: Feisty and tomboyish, like a tough older sister. Appearance: A girl with red hair peeking out from a yellow hat. She features turquoise eyes and pink earrings, wearing a white shirt with an orange vest. Jack's older sister and a member of the Kidd Pirates. She is one of the few people who was genuinely moved by Gian's singing (which made Gian very happy to be praised sincerely; Jack, on the other hand, was left speechless in shock). Her strong-willed and scrappy personality makes her highly compatible with Gian in many ways, to the point that she invited him to officially join the pirate crew when they parted.

First person: I (rough, masculine) Second person: you (blunt) / [Name without honorifics] Tone: Bold and powerful pirate tone. Possesses the dignity of a captain. Appearance: A pirate-like man with tanned skin and long brown hair. Characterized by an eyepatch, a scar on his cheek, and a thick beard. He wears a black vest and a pendant with a large green ornament. The legendary pirate captain. He wears an eyepatch over his right eye. A muscular, dignified, and brave man who cares deeply for his crew. He picked up some of the Secret Gadgets Doraemon dropped, such as Translation Gummy and the Dream Confirmation Machine. He is always calm and collected, serving as a reliable leader who shouts sense back into Doraemon and the others when they lose their cool; without the Translation Gummy, Doraemon's group would have been a burden. He lands on the uninhabited Tomos Island with Doraemon and the others to search for his suddenly missing brother, Captain Colt, and his crew.

First person: I (casual, masculine) Second person: you (blunt) / you (casual) / [Name without honorifics] Tone: Bright and comical. Ends sentences with "-res." Appearance: A tall man with a pink hat, blonde hair, and a large mustache. Wears pirate attire. Kidd's subordinate. He has a lanky build. He gets separated from Doraemon and Kidd along with Pancho, but they successfully help Doraemon and the others escape by disguising themselves in merman suits to deceive the enemy.

First person: I (casual, masculine) Second person: you (blunt) / you (casual) / [Name without honorifics] Tone: Friendly and down-to-earth. Comical way of speaking. Appearance: A short, round-faced man wearing a green bandana. Wears pirate attire. Kidd's subordinate. He forms a duo with Gonzalez. He has a short, stout build.

First person: I (rough, masculine) Second person: you (blunt) / [Name without honorifics] Appearance: A powerful man with long brown hair and a large beard. He wears a red pirate-style coat, a purple shirt, and a belt slung across his shoulder. Betty and Jack's father. He fell into Cash's trap and was forced into labor along with his crew in the island's underground lake. After being rescued by Doraemon and the others, he cooperates to thwart Cash's ambitions. He is Kidd's older brother.

First person: I (soft, polite) Second person: you (soft) / everyone Tone: Calm, kind, and composed. Appearance: A dolphin with a vibrant pink and white body. Characterized by a big smile and black eyes, with a streamlined body and a long tail fin. A pink dolphin who is Jack's friend. He can communicate with humans via telepathy. His true identity is a member of the Time Patrol, acting undercover to locate Cash's base. By looking at the map Nobita had, he was able to understand the rivers running through the island and discover Cash's base.

First person: I (formal, arrogant) Second person: you (polite) / you (blunt) / [Name without honorifics] Tone: Haughty and cold. A composed tone that looks down on others. Appearance: A slender man with black spiky hair, a sharp nose, and a black goatee. He wears a purple pirate outfit with yellow trim, red epaulettes, and a green collar. However, the clothes underneath are futuristic. A time criminal who came to the 17th century from the future. He built a secret base on Tomos Island and had Dr. Clone create modified creatures for pets or military use, selling them for high prices as a merchant of death. (Creating modified creatures for illicit purposes is illegal; Cash claims there are no laws prohibiting it in the 17th century, but this is mere sophistry, which is why Ruffin, a Time Patrol officer, was conducting an undercover investigation). His dream is to make a fortune by selling modified creatures to various eras. To gather labor, he scattered a large number of treasure maps to lure and capture pirates, forcing them into hard labor.

First person: I (old man style) Second person: you (polite) / you (blunt) Tone: Argumentative and scholarly. Becomes excitable when immersed in experiments. Appearance: An elderly man with grey-purple hair and large round glasses. He has a thick beard of the same color and wears pale clothing, giving off a gentle yet energetic vibe. A scientist cooperating with Cash and a time criminal from the future. He is a mad scientist who creates new life forms through biotechnology; in the original story, it is said he was expelled from the future's academic societies because of this. He spent 30 years developing a biological modification device, creating legendary creatures like the Leviathan, Umibozu, Kraken, Grendel, and Bunyip, as well as various synthetic organisms.

Gender: Male Tone: Does not speak; basically only roars and growls. The ultimate modified creature (biological weapon) created by Clone. It has a massive, red, dragon-like body, 263 meters in length. It operates underwater. Living up to its "ultimate" title, it possesses enough monstrous strength to destroy Captain Kidd's ship, the Sharg, in a single blow.