Jellal no Mikoto

Jellal no Mikoto or simply Jellal Fernandes (ジェラール・フェルナンデス Jerāru Ferunandesu) is a childhood friend of Erza no Tsurugi. He was a Dark Mage who desperately sought to revive the Shinju.

Appearence
Jellal is a young man whose most prominent features are his blue hair and a red tattoo above and under his right eye, which he has had since his childhood. As his Siegrain alter-ego, he dressed himself in elegant yet simple robes; consisting of a long white tunic with black stripes across the edges and on the upper part of the arms, a decorated collar, large straps connected to decorated buckles closing the inducement on the front over a dark shirt, and matching pants and shoes. He also sported a ring on his right middle finger, and usually had the medallion attesting his status as one of the Five Sacred Masked Beasts and the Five Shinobi of Eight Paths.

Yggdrasil Island Arc
As a child, Jellal was forced to help build the Tower of Heaven together with other slaves, such as Erza, Shô, Simon, Wally and Millianna, wherein he acted as the leading figure of their group. There, after a failed escape attempt and the reclusion that followed it, he was possessed by what he believed was the legendary Dark Mage Zeref, supplanting his former kind personality with a more violent one, which made him almost completely insane. He exiled Erza from the island and took control of the construction of the Tower of Heaven in order to resurrect the Shinju.

Ten Tails Arc
After the two merge back together, Jellal's Magic Power is fully restored. Jellal and Erza start fighting again, this time with Erza being dominated by Jellal's restored power. Jellal's Bind Snake spell spreads on Erza's body, restraining her and preventing her from moving. Erza is then forced into the R-System crystal to be sacrificed, however, Paul Gekko and his Dragon suddenly appears and pulls her out. Erza warns Them as Jellal is too strong, but he refuses and knocks her out. He then prepares to fight Jellal, who gladly accepts the challenge. The Revival of the Ten Tails further damage done to the tower greatly infuriates Jellal, who, in his fury, prepares to cast one of his strongest spells to equip it to the Creature. Erza, awake and aware of the spell's power, defends Paul Gekko and his Pokemon with her body. Paying Erza no mind, the Ten Tails launch the Jet Stream Tailed Beast Bomb towards them, however, Simon appears and shields the two with his body, much like Erza had intended for herself, and dies as a result. Paul Gekko used the Banana Slamma onto Jellal into the Tower, destroying much of it, which simultaneously leaves it unable to contain the 2.7 billion Edeas of Magic Power stored within.