Midna

Midna is one of the Twili, a race descended from wielders of powerful and evil magic who were banished to an alternate dimension by the goddesses Din, Farore, and Nayru after an event known as the Interloper War. This alternate dimension, out of which the sublimated descendants could only exist as shadows, eventually became known as the Twilight Realm.

Prior to the events of Twilight Princess, Zant, one of the Twili, overthrew Midna from her throne and placed a curse on her, giving her the imp form that she maintains for most of the game and depriving her of the magical powers that are granted to the leader of the Twili. Midna, already in possession of a Fused Shadow, leaves the Twilight Realm and witnesses Link as a wolf being taken away by a Shadow Beast. Knowing the Twili legend that the Hero would appear as a "divine beast," Midna follows Link to his prison cell in the Castle Town Sewers and tells him that she will help him escape if Link does exactly as he is told. The pair eventually exit the sewers and go to a tower in Hyrule Castle to meet with Princess Zelda, whom Midna mockingly calls "Twilight Princess" and blames for Hyrule's current state.

Quotes

 * So, you're not absolutely stupid after all!
 * You don't have to look so sad! We actually find it to be quite livable! I mean, is perpetual twilight really all that bad?
 * Well, well... You're the chosen hero and all that, huh? So THAT'S why you turned into that beast!
 * After all, a fake is a fake...and no matter how much you dress it up, the real thing always wins!
 * Some call our realm a world of shadows, bt that makes it sound so unpleasant... The twilight there holds a serene beaulty... You have seen it yourself as the sun sets on this world. Bathed in that light, all the people were pure and gentle... But things changed oonce that foul power pervaded the world...
 * What? Say Something! Am I so beautiful that you've no words left?
 * Well...I huess this is farewell, huh? Light and shadow can't mix, as we all know. But...Never forget that there's another world bond to this one.
 * Zelda... Your words are kind, and your heart is true. If al in Hyrule are like you...then maybe you'll do alright
 * Thank you... Well, the princess spoke truly: as long as that mirror's around, we could meet again
 * Link...I...See you later...
 * You'll come with me... Right?
 * The only thing to do is try all your sword techniques on it until you find one that works! Don't Worry! You have what it takes to beat him!
 * This thing just depresses me... Get him down here and introduce him to your blade!
 * Ugh... It's creepy... I can't stand pimply things like this... This one's all yours!
 * If we waste our time dealing with this,, we'll never find Zant! Don't bother yourself with those little nuisances! Attack Zant's image!
 * Do you now understand what i am?
 * I am a descendant of the tribe that was banished to the Twillight Realm!
 * Zant!
 * My KING? You, who do nothing byt abuse the magic of your tribe? You must be joking!
 * Please... Please tell me.. How do we break... The curse on this one?
 * This... Is the one... You need him... to save your world
 * That's why... Princess... Please... You must help Link!
 * Can you tell him... where to find the Mirror of Twilight?