Weisslogia

Weisslogia (バイスロギア Baisurogia) was a Dragon known as The White Dragon (白竜 Hakuryū) and was the foster father of Sting Eucliffe.

Appearance
Weisslogia is a light-colored, gigantic, bearded Dragon with feathery, angel-esque wings. Weisslogia also has two comparably small antlers protruding from the top of his head. Weisslogia's underbelly is quite smooth, while the majority of his body, save for part of his feathery, windswept face, and his spine (which is adorned with a trail of hair that starts from Weisslogia's head), is covered with thick scales.

Personality
Weisslogia was a very selfless Dragon, having taken in and raised a young Sting Eucliffe like he was his own son. Furthermore, Weisslogia opted to forfeit his own life solely for Sting's future growth. However, upon revealing that the latter fact was a lie to keep Sting unaware of where he had gone, Weisslogia still kept in line with his supposed caring persona, as he disappeared and rewrote Sting's memories to prevent him from turning into a Dragon.

History
Many, many years ago, Weisslogia's soul was taken by Acnologia's Dragon Slayer Magic, which left him in a half-dead state.

Sometime during his life, Weisslogia taught Sting how to use the Magic once fabled to be able to kill Dragons themselves: Dragon Slayer Magic; White Dragon Slayer Magic gave Sting the characteristics of Weisslogia himself. However, Weisslogia instructed Sting to kill him and bathe in his blood so that he could become a "true" Dragon Slayer. However, it is later revealed that Weisslogia faked his death (via Memory Control) and hid himself inside Sting with a secret art, much like the foster parents of the other Dragon Slayers. While inside Sting, Weisslogia created antibodies to prevent him from turning into a Dragon like Acnologia and waited patiently for the right time to emerge and kill the Black Dragon whom he was trying to prevent Sting from becoming.

Tartarus arc
After the timer for Face reaches zero, Weisslogia appears alongside the foster parents of the Dragon Slayers and helps them in destroying a large number of Face bombs.

After Acnologia retreats, Weisslogia lands in front of Fairy Tail and the other and reunites with Sting, much like how the others reunite with their kids. When questioned about his supposed death by Sting, Weisslogia reveals that he and Skiadrum rewrote the memories of both of him and Rogue, though Skiadrum chimes in and says that Igneel was against this. Weisslogia then explains that have already died, and it is revealed that the Dragons lost their souls to Acnologia's Dragon Slayer Magic many years ago, as well as that they hid in the Slayers' bodies to prevent Dragonification, to kill Acnologia, and to prolong their own lives. Furthermore, they cannot return once they have exited the body. The Dragons then rise and prepare to depart, claiming that in accordance with the Magna Carta forged between their two races four hundred years ago, they will watch humanity as they create the future. Before disappearing, Weisslogia smiles at Sting as he is thanked for all he has done.

Magic & Abilities
White Dragon Slayer Magic (白の滅竜魔法 Haku no Metsuryū Mahō): Weisslogia has been seen using his Magic to create various pillars of light to destroy myriad Face bombs by his lonesome. Weisslogia also taught Sting how to use his particular variation of Dragon Slayer Magic.

Memory Control (記憶操作 Kioku Sōsa): Weisslogia has the ability to manipulate the memories of humans at will, and did so to completely rewrite the events of his disappearance in Sting's mind. However, it was noted that Igneel was completely against him using said Magic on his own children.

Flight: Being a Dragon, Weisslogia possesses the ability to fly through the air using his wings.

Immense Strength: All by himself, Weisslogia is able to easily ram through and destroy numerous Face bombs. This strength, however, is a mere fraction of what Weisslogia's truly was before his soul was taken by Acnologia many, many years ago.

Trivia

 * "Weiss" (correctly written as "weiß") is German for white.