Zoldeo

Zoldeo was a member of the Grimoire Heart and one of the Seven Kin of Purgatory through possession of Capricorn's body. He was also once a servant of the Heartfilia Family.

History
Not much is known about Zoldeo past. He was once a trusted servant to Layla Heartfilia, gaining the Capricorn key after she retired and was expected to help protect the family. But become twisted and corrupted, swallowed up by the darkness. At one point, he broke a taboo of the Celestial Spirits and somehow his spirit got transferred into Capricon's body. It's presumably because of this, that Capricorn was able to stay in human world for 17 years. It also presumably during time not long after, he was found by Master Hades and join Grimorie Heart, becoming one of the Seven Kin of Purgatory.

Synopsis
Most of his actions are covered in Capricorn's section. As its essentially him controlling Capricon's body.

He winds up battling Gray, Lucy, Loki, and Cana on Tenrou Island outclassing all four. Loki sends his teammates away to battle him alone as Zoldeo was using magic that affected humans, but not spirits. Once gone, the two fight with Zoldeo realizing that Lucy is Layla's daughter and vows to kill her. He tries to send his summoned warriors after her, but Leo easily defeats them. Zoldeo then reveals himself as he uses the magic that fused his spirit with Capricorn's body, Human Subordination Magic: Huma-Raise, to take over Leo's body.

He succeeds but is hit from behind by Capricorn who uses a Regulus blast that Leo had transferred into him before Zoledo swapped bodies. The attack forces Zoledo from his body and into his original form. He at first rejoices at regaining his body, but as he now nothing more then a spirit. He, much to his horror, start to dissolve away till he fades to nothing.