Coop is a fictional character on the television series Charmed. He is a cupid. He is played by Victor Webster.

Cupids are a race of magical beings, associated with love. Coop was sent by the Elders to help Phoebe with her love life. He gave her advice on her love life, and took her to the past to see her past loves (Cole Turner, Dex Lawson, etc.), allowing her to love again.

Later in the series, they fall in love (Coop falls first and Phoebe falls for Michael, someone whom Coop was manipulating for Phoebe to love), although it was forbidden for a Cupid to fall in love with a human, similar to how it was forbidden for Whitelighters to date, marry, or have children with their charges. Only later in the series does Phoebe begin to admit her feelings for Coop.

In the show's finale, future adult Wyatt exclaims "Uncle Coop!" upon seeing him, which accidentally lets slip that Coop is Phoebe's husband and thus his and Chris' Uncle. While Chris immediately hits Wyatt to hush him up since he has revealed the unknown future, Phoebe seems freaked out at this idea, since she knows about the forbidden nature of this romance. After he tries to talk to her and reassure her to no avail, he finds himself attacked by Billie's manipulative demon friend Dumain for his ring's time travel ability. Also in the finale, Piper uses his ring to travel through time as well to save Phoebe and Paige.

When Phoebe's calls for him fail, Wyatt and Chris reveal that their love is given a blessing (and was the main underlying reason he was actually sent down) by the Elders to make up for all the events they put her through as a Charmed One. In the exact words of Wyatt, "It wasn't, and it will not be, a forbidden love." In addition to that, she was able to bring him to her by simply thinking of him due to their connection. The Charmed Ones are able to use Billie's Projection power to travel back in time, and after they vanquish the Triad and Piper vanquishes Dumain, Paige retrieves his ring from Christy and Piper gives it back to him upon their return to the present.

The same episode, which depicts the futures of the Charmed Ones, shows their wedding and the three daughters they eventually have.

It is interesting to note that in season 3, Phoebe is told that an apple peel in water will take the form of the first letter of the name of her true love. It is a "C," which at that time was meant to imply Cole. This prediction does come to pass though, as Coop is revealed to be her true love

Info from Wikipedia