Sailor Moon

Usagi Tsukino/Sailor Moon is the main protagonist of the Sailor Moon series.

Footwear
Usagi Tsukino is a junior high school student, and also the true identity of Sailor Moon, who fights against the evil villains. She transforms into Sailor Moon with her transformation brooch, and then her outfit including her footwear drastically changes.

Usagi usually wears black cross-strapped shoes with her school uniform. Or when in the class, she wears white single-strapped shoes as indoor shoes. These are common in Japanese junior high school.

However, when she starts her transformation into Sailor Moon, she no more wears these type of shoes. During her transformation, her shoes and socks are lost, and she stays barefoot. Then red ribbons from her brooch wraps up her legs and feet tightly. She exposes her ribbon-wrapped legs, and the ribbons of her legs shine brightly, and then the light is gone, she wears red knee-high boots. Then her transformation completes. In Stars series, she wears white knee-high boots instead of former red one. When transforming into Eternal Sailor Moon, she puts no ribbons on her body including her legs, and then the white boots appears suddenly just before her transformation completes.

When her transformation brooch is attacked in action, she cannot keep herself transformed. Soon her Sailor outfit turns to ribbons, and she is encased in her transformation ribbons. Her boots also dissolve into ribbons, so she wears ribbon-boots, a half-detransformed shape of the boots. Soon the ribbons unravels and her barefoot is exposed, and then she wears the shoes which she wears before transformation (but in some episode, she wears her white strapped shoes before the ribbons on her legs disappears). In Stars series, her transformation is forcibly undone when Galaxia, the final boss, extracts the power source of Sailor Moon's transformation from her brooch. Soon she is clad in her transformation ribbons, but fails to return to her civilian forms. She stays half-detransformed, barefoot, and her legs are ribbon-clad, so no shoes are re-appeared on her feet.