Strudel (シュトルーデル, Shutoruuderu), known as Ruu (ル, Ru) for short, is a fairy in the Rosenkreuzstilette series, first appearing in Rosenkreuzstilette ~Freudenstachel~. Her role is similar to that of a fellow fairy, Lilli, in the original Rosenkreuzstilette, and she assists Freudia Neuwahl as her fairy partner as she gets to the bottom of the mysteries of the Schwarzkreuz and their hidden agenda.