I-203
I-203 is a submarine ship girl in Kantai Collection, based on the third vessel of the Imperial Japanese Navy's I-201-class (Sen-taka type) high-speed submarines. Often referring to herself as "Fuumii," she was introduced during the Spring 2021 Event. Reflecting her historical origin as a high-speed submersible built near the end of World War II, she takes great pride in her underwater swiftness while displaying frugal daily habits. She enters battle dressed in a distinctive two-piece outfit combining elements of a school swimsuit and an athletic-style sailor uniform.
Overview
I-203 is a submarine ship girl in Kantai Collection, based on the third vessel of the Imperial Japanese Navy's I-201-class (Sen-taka type) high-speed submarines. Often referring to herself as "Fuumii," she was introduced during the Spring 2021 Event. Reflecting her historical origin as a high-speed submersible built near the end of World War II, she takes great pride in her underwater swiftness while displaying frugal daily habits. She enters battle dressed in a distinctive two-piece outfit combining elements of a school swimsuit and an athletic-style sailor uniform.
Appearance
I-203 features long blue hair with prominent sidelocks, blue eyes, and head rigging. Her standard attire consists of a sleeveless crop top with a white sailor collar and white neckerchief, paired with a dark blue short skirt over swimsuit bottoms. She wears black fingerless elbow gloves and black open-toe thigh-high boots fitted with side propellers and rudder heels. Her rigging connects two split hull units via back arms, while she dual-wields retractable 25mm anti-aircraft guns. Upon remodel, her gloves fully cover her fingers, the gun grips turn brown, and her chest ribbon tips become white. She also possesses seasonal outfits including a translucent rainy-day shirt with an umbrella, a backless summer top with a miniskirt, a white yukata with hair buns, and specialized holiday attire.
Personality
I-203 generally speaks in a calm, detached manner with a signature speech pattern where certain syllables are rendered in katakana. She takes immense pride in her mobility under water, enjoying running and treating physical exercise as a post-meal routine. Conscious of the historical battery issues inherent to her ship class, she diligently inspects and maintains her equipment during down time. Having entered service late in the war, her lifestyle remains deeply frugal, preferring simple meals such as rice with miso soup or rice balls. Following her remodel, her demeanor becomes slightly warmer and more self-assured.
Abilities
I-203 boasts exceptional evasion stat values among submarines. While her base surface firepower is extremely low—even below Maruyu Kai—her high torpedo rating allows her to deliver strong night-battle damage. Though categorized as low speed by default, she is uniquely capable among submarines of reaching "High Speed" status by equipping a New High Pressure Boiler, and "High Speed+" when paired with an Improved Kankon Turbine. Upgrading to her Kai form unlocks a second equipment slot. Additionally, she possesses a rare anti-air stat for a submarine, although anti-aircraft guns cannot be directly fitted into her regular equipment slots.
Background
Her historical counterpart, the I-201-class submarine I-203, was completed at Kure in June 1945. She conducted training in the Iyo-nada Sea but did not engage in combat before the war concluded. Following the conflict, she was surrendered to the United States Navy, evaluated in Hawaii, and subsequently scuttled. In Kantai Collection, she debuted as a drop reward during the Spring 2021 Event. Because her real-world service was cut short before seeing battle, her knowledge of other fleet members is limited primarily to those from her assigned unit, yet she proudly performs her duties as a state-of-the-art submarine.
Relationships
I-203 respects I-47, addressing her as "Yona-senpai," though she expresses slight confusion when seeing I-47's personal summer swimwear. She maintains a close connection with her lead class sister, I-201, whom she refers to as "Ane-1" and who occasionally provides her with Saturday curry meals. Regarding other fleet members, she recognizes Chogei, the flagship of the 11th Submarine Squadron, while having no direct acquaintance with Chogei's sister ship Jingei or the notoriously fast destroyer Shimakaze.
Trivia
A notable trait of her illustrator, Hoshiakari, is retaining the character's head-mounted rigging even across seasonal outfits like rainy-day casualwear or holiday attire. Due to the phonetics of her self-chosen nickname "Fuumii," some fans historically associated her with an obscure gag manga nickname, though the community generally discourages using this term to prevent confusion or disrespect.
