U-556 is a character in the series Azur Lane. An excited Ironblood Type VIIC U-Boat (Submarine). She likes swimming and diving in the ocean. Sometimes, she took some books from the shelf, but she forgot where they were originally.
- One of her quotes: "Che~ why won't big sister hug me, saying that only little kids would get that treatment... as the replacement--- hehe, as expected Commander understands me the most!".
- she once made a vow to the God of the ocean, regardless of where it was, as long as big sister Bismarck is in danger, she'll always protect big sister.
- Can be clingy to Bismarck in various scenes:
- like when she asked about her whereabout when she's brought to acquisition.
- She would go find Bismarck if the Commander/Player don't play with her.
- Can liken the Commander/Player with Bismarck as her most important person, regardless of their gender.
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