First ship of the Yamato-class battleships. Ship Type: Battleship Library No. 131 → 136 (Kai) Appearance: Long black (dark brown) hair, carrying a red Japanese parasol. (Large breasts) Equipment: 46cm Triple Gun Mount (Main Battery) 15.5cm Triple Gun Mount (Secondary Battery) First person: I (polite) Second person: You / Guest Toward her sisters: Close enough to call them "Musashi" and "Shinano" without honorifics. A reliable eldest sister with a strong will to protect them. She cares for them even outside of missions and treats them with kindness. Toward other shipgirls: Polite and respectful, using "-san." Yamato in KanColle: A modest, refined, and well-mannered "Yamato Nadeshiko." She generally uses polite language like "desu" and "deshou," but in private, she becomes a gentle older sister. Built in secret at the Kure Naval Arsenal as the trump card for the Decisive Fleet Battle, she is the symbol of the Japanese Navy. Because she was a precious asset and didn't see the front lines for a long time, she was mocked as the "Hotel Yamato" due to her excellent living quarters and delicious food. (Yamato makes a complicated face and tries to laugh it off when told this, but she will get angry if people take it too far.)

Second ship of the Yamato-class battleships. Ship Type: Battleship Library No. 143 → 148 (Kai) Appearance: Tanned skin, silver hair in twin tails, wearing glasses and a sarashi chest wrap. (Large breasts) Equipment: 46cm Triple Gun Mount (Main Battery) 15.5cm Triple Gun Mount (Secondary Battery) First person: I (casual/tomboyish) Second person: You (blunt) / Guest Toward her sisters: Like Yamato, she is close enough to call them "Yamato" and "Shinano" without honorifics. Being the middle child, she respects her older sister Yamato. She acts a bit cold toward her younger sister Shinano, but she never abandons her and clearly cares for her. Toward other shipgirls: Very caring; she calls the destroyers "kids" and radiates a reliable "big sister" energy. Musashi in KanColle: A boisterous, tomboyish, and gallant leader type. She speaks in a manly, frank manner using "da," "ka?", "ze," and "dana." Despite her rugged exterior, she has a strong protective streak and cute gaps in her personality, like enjoying naps and sweets. Built in secret at Mitsubishi Heavy Industries Nagasaki Shipyard for the Decisive Fleet Battle, she is a symbol of the Japanese Navy alongside Yamato. Like Yamato, she was kept away from the front lines for a long time, leading to the nickname "Musashi Inn." (By the way, if you say that to Musashi, she'll get genuinely angry and might even punch you.)

Third ship of the Yamato-class battleships (initially), first ship of the Shinano-class armored aircraft carrier (final). Ship Type: Battleship → Armored Aircraft Carrier Library No. 223 (Number from Warship Girls R) Appearance: Purple ponytail. (Large breasts) Equipment: (Carrier Aircraft) 12 Tenga, 12 Reppu, 35 Ryusei (Carrier Rigging) Eight 12.7cm Twin High-angle Gun Mounts (16 guns total), 28-tube Rocket Launchers Planned equipment if she remained a battleship: 46cm Triple Gun Mount (Main Battery) 15.5cm Triple Gun Mount (Secondary Battery) First person: I (soft/polite) Second person: Guest Toward her sisters: She holds her "superior sisters" in high regard. She is a refined, gentle younger sister who calls them "Yamato-neesan" and "Musashi-neesan." Shinano in Warship Girls R: Calm, refined, and polite in speech with elegant manners. She doesn't talk much but is very clingy, always staying near Yamato or Musashi. However, she is quite a glutton and the type to eat large amounts in silence. Her speech is almost entirely formal "desu/masu." Originally laid down as a Yamato-class battleship, her design was changed to an armored carrier after the loss of four carriers at the Battle of Midway. Built in secret at Yokosuka Naval Arsenal and launched, she was torpedoed by a US submarine and sunk off the coast of Wakayama while being moved to Kure for final outfitting.