Kyra

Kyra (referred to as simply "The Seer" in Demonic circles) was a Seer who could do exactly that, see the future. Her powers make her a target for many other demons especially when she wants to sell them out to the Charmed Ones. Prior to that, however, she can be seen helping Leo Wyatt see that his face was tied to a threat on his son ("Cheaper By The Coven") and revealing to a half-demon named Sirk that his last human blood relative was an unborn child. ("Styx Feet Under")

Betraying the Underworld
Conditioned to believe that as a demon she couldn't have feelings, or at the very least was not supposed to have feelings, she quickly became disenchanted with her life as a Seer. Thus, she became good, betraying the Underworld as soon as she landed the information that would give her the chance.

Utopia
She made a deal with the Charmed Ones to make her human in exchange for information and also a look at the "Utopia" that the Avatars were planning to orchestrate, eventually gaining a bond with and passing on her vision of this future to Phoebe Halliwell through the two linking hands {with Phoebe able to revisit the vision at will, afterwards}. She was killed by the powerful demon Zankou, because he was afraid of what she might tell the sisters, and for her betrayal. ("Witchness Protection")

Humanity Spell
This spell was written by Phoebe to transform Kyra into a human, it was to be used by the sisters, along with the powers of the Elders; it was written in a deleted scene which never aired on television but was seen in a featurette on a behind-the-scenes look at Witchness Protection.


 * The Power of Three now acts as One,
 * To make this Demon come Undone.
 * We Vanish the powers and evil of She,
 * Now Bless her with Humanity.

Trivia

 * Charisma Carpenter who portrayed Kyra is best known for her award-winning role as Cordelia Chase, a character in Buffy the Vampire Slayer and Angel who eventually obtains a gift of clairvoyance similar to Kyra's. Both characters proceed to eventually die as well as pass on a crucial vision to a friend within the same day. In Kyra's case it was the vision of Utopia to Phoebe, in Cordelia's case, it was a vision of how Angel was to defeat his final enemies passed to him through a kiss.
 * Charisma Carpenter was one of several actresses that auditioned for the role of Paige Matthews.