One of the many trademarks of a Magical Girl Anime show is the transformation sequence. This is the bit of stock footage accompanied by a peppy BGM that changes the ordinary young girl into her Magical alter-ego. She is surrounded by everything from flashing colors and ribbons, to wings, balloons, and bubbles.A transformation sequence is usually shown in every episode, sometimes more than once, so the animation during it is usually of a bit higher quality than the animation in the rest of the series. A good transformation sequence will not bore the viewer. With stunning animation and an exciting BGM, a good transformation sequence is entertaining with every watching.
Common questions about transformation sequences are: Why do they take so long, and what are the badguys doing in the meantime? Why don't they just attack during the transformation, when the girl is vulnerable?
Ocasionally the Magical Girl is attacked in mid-transformation, but this is very rare. To save time, transformations can be cut short, combined with the transformations of other Magical Girls in that show, or omitted completely.