U-31

U-31 is a SR rarity submarine from the Iron Blood faction in the game Azur Lane. She is a cunning character who claims to be the commander's bodyguard and often conducts "safety checks" on the commander under the pretext of "protecting the commander's safety." U-31's skills include deploying mines on the battlefield, dealing extra damage to flooded enemies, and possessing the common Iron Blood submarine "wolf pack" skill, which can improve her own and other Iron Blood submarines' attributes in the team. Her historical basis is the German WWII Type VIIA submarine U-31, which was repeatedly sunk and repaired, and participated in multiple combat missions. In the game, U-31 is unique in that she can reduce the movement speed of enemy battleships through her mine skills, which can play a key role in certain situations. At the same time, her slightly yandere personality also makes a deep impression on many players.