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. 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 she'll help him escape if Link does exactly as he's told. The pair eventually exit the sewers and go to a tower in Hyrule Castle to meet with Princess Zelda, who Midna mockingly calls "Twilight Princess" and blames Zelda for Hyrule's current state.
After the meeting with Zelda, Midna reminds Link that he must still save Ilia and the rest of the Ordon children that were kidnapped, saying that she'll be happy to help the young hero if he acts like her "servant." Once Link finds the first Fused Shadow in the Forest Temple, Midna reveals that was the item that she was looking for, but refuses to tell Link their exact purpose or what she plans to do with them. The power of the Fused Shadows can be used to destroy Zant, returning Midna and the other Twili to their true form. Midna does not tell Link, however, that she wants the Fused Shadows for the benefit of herself and her world.
Upon collecting all Fused Shadows, Zant confronts Link and Midna in the Lanayru Spring and easily takes the Fused Shadows from them. He then tries to persuade Midna to join his side, but after she refuses, he holds her up in front of the Light Spirit Lanayru, who gravely injures Midna by overexposing her to its light. With Link now once again as a wolf and Midna nearing death, the young hero takes her to Princess Zelda in Hyrule Castle. The dying Midna, no longer caring for her sake, asks that Zelda tell Link how to break his curse since he is the only one who can defeat Zant. As a last request, Midna pleads to Zelda to inform Link where he can find the Mirror of Twilight, and Zelda, having heard this, chooses to revive her by transferring her soul within Midna's body, disappearing in the process. After seeing the unselfish acts made by Zelda and Link, Midna has a change of heart and vows to help save Hyrule from Zant. The duo eventually arrive to the Gerudo Desert, where Midna asks for Link's help in finding the Mirror of Twilight, their last potential link to Zant.
Eventually, Midna and Link reach the Mirror Chamber an find that the Mirror of Twilight has been broken into four Mirror Shards, with only one of them remaining in the mirror. After learning from the Sages the location of the remaining three shards, the pair find them and return to the Mirror Chamber to complete the mirror, where the Sages reveal that Midna is the true Twilight Princess and ruler of the Twili race, not Zelda, who had previously been defined as the Twilight Princess by Midna herself, presumably to keep a cover on her identity. Zant, after usurping the throne from Midna, placed a curse on her that gave her the form she maintains for most of the game. This curse could presumably not be lifted until Ganondorf, the source of Zant's power, was defeated.
Once Link has faced Zant in battle, Midna uses the Fused Shadows to destroy Zant. She uses only a fraction of the power that the Fused Shadows hold to do this, and is utterly bewildered by their power.The Fused Shadow's power is also used to break the pyramid-shaped barrier around Hyrule Castle. Midna uses the power to transform into a giant, spider-like beast with a large pole-arm weapon (see right side). This same form is used in an attempt to destroy Ganondorf during the ending sequences of the game, but ultimately fails. Shortly thereafter, Ganondorf is seen holding up the helmet part of the Fused Shadows that was Midna's trademark garment, breaking it in his hand.
Midna's Wolf:
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