Library No.: 123 Class: Junsui Otsu-gata, 3rd Ship Ship Type: Submarine Illustrator: Shobon Appearance: A highly provocative design where "calculated cuteness" and "childishness" coexist. Hair: Bluish-purple hair with a vibrant pink gradient towards the tips. A unique hairstyle tied at the top and hanging down like twin tails. Eyes: Red eyes with a pink star mark (★) inside. Clothing: Wears a navy blue old-style school swimsuit. Physique: Has a childish face (often with a dazed, melting smile) but possesses very generous bust armor. Personality/Speech: A carefree, spoiled, and slightly devilish personality. Unique Mannerisms: Refers to herself as "Iku" and speaks in a drawn-out way, ending sentences with "~nano" or "~no ne." Attitude toward Admiral: Very friendly and attached to the Admiral. If left alone, she might demand "punishment" or give a shoulder massage that she intentionally makes painful, showing a mischievous side. Airheaded Love: Her affection is a bit skewed and natural; she says things like "I like you because you don't get mad no matter what I do."

Library No.: 127 Class: Junsui Otsu-gata Kai Ni, 1st Ship Ship Type: Submarine Illustrator: Shobon Appearance: Designed by the same artist as I-19, featuring a refreshing look based on a school swimsuit and "scuba diving" motifs. Hair: Vibrant green short hair (wavy bob cut style). Eyes: Beautiful green eyes matching her hair color. Clothing: Wears a navy blue old-style school swimsuit. Physique: Slender and smaller compared to I-19 (a so-called toddler physique), emphasizing the "loli" feel typical of submarine girls. Personality/Speech: Refers to herself as "Goya." She is devoted, hardworking, and a bit of a realist who tends to grumble. Unique Mannerisms: Her most defining trait is ending sentences with "~dechi" (e.g., "Submarine I-58, heading out dechi!"). Attitude toward Admiral: Very obedient and trusts the Admiral, but has a realist side that complains about harsh submarine missions (like sorties to the Orel Sea), calling it a "Black Naval Base dechi..." Devoted Hardworker: Despite the grumbling, she handles missions positively, saying "Goya will do her best dechi!"

Library No.: 126 Class: Kaidai VIa-gata, 1st Ship Ship Type: Submarine Illustrator: Shobon Appearance: Designed by Shobon like I-19 and I-58, but with mechanical parts and a competitive swimsuit-style outfit, giving a sportier and slightly more mature impression. Hair: Long bright strawberry pink hair tied into thick braids on both sides. Eyes: Large blue eyes. Clothing: Wears a form-fitting navy blue competitive swimsuit. Physique: Has a smart, toned body with sufficient development (bust armor), though not as much as I-19. Personality/Speech: Refers to herself as "Imuya." She is serious, proud, and acts as the big sister/organizer for the submarine girls. Tsundere Attitude: Often takes a cold, dismissive "tsun" attitude toward the Admiral. However, when moderately damaged, she gets angry saying "Hey, what are you looking at!" while actually relying on the Admiral in her heart. Professional Pride: Holds strong pride in her combat record, specifically the historical sinking of the US carrier Yorktown at the Battle of Midway. She maintains a professional, vigilant stance, saying "Don't underestimate me just because I'm a submarine." Voice of Reason: Often gets dragged along by the pace of the more eccentric submarines (like I-19 and I-58), showing a hardworking side as she looks after them.

Library No.: 128 Class: Junsui 3-gata, 2nd Ship Ship Type: Submarine Illustrator: Zeco Personality: Argumentative, book-loving, and intellectual. An indoor type who speaks in a calm tone rare among submarine girls, calling herself "intellectual" and a "bibliophile." Due to the historical Yanagi missions to Germany, she occasionally mixes in German words (like "Guten Tag" or "Danke"). Slightly sharp-tongued and surreal; she says biting or surreal things in a flat tone like "Admiral, if you stay like that, you'll just be a useless person" or "I thought I was going to die. No, I won't die, though." Obsessed with reading; if left alone, she spends her time at her own pace, saying things like "I'll take this chance to read the book I borrowed from Spee (Admiral Graf Spee)." Appearance: A girl with glasses. Hair is a yellowish-beige close to bright blonde, styled in large braided pigtails. Her charm point is her red plastic-framed glasses, which are very rare for submarine girls in Kancolle. Like I-19, she wears a navy blue school swimsuit and has a small pendant like a charm around her neck.