Fakir, from Princess Tutu, is my favorite tsundere character. Now you might think, "Jarmihi, that's not tsundere. Maybe you need to re-think your love life," which might be true. However, taken from a more general point of view, he truly represents tsundere, particularly toward Ahiru.
At the opening of the story, Fakir seems cold and harsh, often brushing Ahiru off his shoulder like a fallen leaf. As they find themselves more and more inextricably linked to the goal of saving Mytho, Fakir begins to open up to Ahiru (at first unknowingly). At this point, Ahiru learns that Fakir is really a warm, caring person who happens to have a sharp tongue at times, the very definition of tsundere.
Tsundere doesn't require a shy, overly unethical (if you take my meaning) teenaged schoolgirl who covers up her insecurities with a brash attitude. It can be as subtly beautiful as the companionship between a knight and a hero.
|Fakir - tsuntsun|
|Fakir - deredere|
"Tomorrow's" prompt: "something moe"