|Favourite Food||Tuna sushi|
|Disliked Food||Barley rice|
|Favourite Subject||Political science|
|Origin||Namegata, Ibaraki Prefecture|
Mayumi Uchida is the Harekaze's starboard navigation controller and one of the characters of Hai-Furi. Her nickname is Mayu-chan.
Her favorite saying is: “Make a fortune at a single stroke.”
Mayumi wears the school uniform but with a longer skirt, around knee level. She has a darker skin tone than most crew members, which was a result of getting sunburned at one point. She has purple eyes and maintains a braid, tied by a blue-green bow, on her left side.
As the eyes of the Harekaze on its starboard, Mayumi knows how to remain calm, even in a pitched battle.
- In Japanese, her name means "true bow." Owing to her calm personality, it takes on the Filipino meaning for "gentle."