Great Red

Great Red also known as the Apocalypse Dragon, the True Red Dragon God Emperor, True Dragon, and the Dragon of Dragons, is a powerful Dragon that resides in the Dimensional Gap. It is the dragon recorded in the Apocalypse.

Appearance
Great Red is a massive red Western who has at least lived for 10,000 years with a horn on his snout and has two sets of wings. His overall length measures around 100 meters. He is the third-largest Dragon in the series, after Midgardsormr, and Apophis.

Personality
Not much can be deduced on Great Red's personality, but Issei compared his personality to that of a biker gang delinquent, claiming that Great Red travels around the Dimensional Gap doing crazy moves and gets aggravated at people that are staring at him.

History
Not much is known about Great Red's past except for the fact that he has occupied the Dimensional Gap for quite some time, apparently taking residence after Ophis left. Some time before the series, he was challenged by Tannin (a former Dragon King) to a fight but he ignored him.

Birth of the Breast Dragon Emperor
Great Red made his first appearance in Volume 6, while traveling through the Dimensional Gap.

The Heroic Oppai Dragon
In Volume 12, Great Red saves both Ophis and Issei from the crumbling dimension and restores Issei's body with his flesh. He also lends Issei his power during his fight against the Jabberwocky, fusing with Issei to create a gigantic version of the Scale Mail to battle the Jabberwocky, claiming that the Beast (referring to Jabberwocky) is staring at him. He returns to the Dimensional Gap after Issei uses the Longinus Smasher to demolish the Jabberwocky in one shot. He then returns to the Dimension Gap while saying "Zoom Zoom Iyaaan" (from Oppai Dragon's theme song) repeatedly to Issei and Ddraig, much to their dismay.

Powers & Abilities
Immense Strength: Great Red is immensely powerful, as shown by him giving Issei a portion of his powers, which gave Issei power so incredibly destructive that it was even capable of destroying a part of the Underworld without leaving a trace. The Great Red is also more powerful than the Two Heavenly Dragons or Gods and is stated to be strong enough to be able to ignore the assault of a Dragon King or an Ultimate-Class Devil.

Dream Embodiment: Being an existence with the power of dreams, Great Red can descend into people's thoughts and turn dreams into reality. He can completely control dreams and the dreams of others. He can attack or protect others in dreams, as well as affecting the real world to some degree via dreams or daydreams and can still affect the dreams of others even if he himself is not asleep. He gains power from dreams and can live on in dreams if he is killed in the real world.

Flight: As a Dragon, Great Red can use its colossal wings to fly.

Soul Transferal: Great Red has the power to transfer the souls of other beings into other vessels. This was shown when he transferred Issei's soul into a vessel made from his flesh as Issei's original body was destroyed.

Primordial Dragon Physiology: Great Red is one of two ancestral dragons (the other being Ophis) who came before all dragons in existence. As an ancestor of all dragons along with Ophis, this status makes him far stronger than any dragon or reptilian creature in existence.
 * Dragon God Physiology: As a Dragon God, Great Red possesses a level of power that makes him the strongest and most powerful of all dragon-kind alongside Ophis.

Body Creation: Great Red can create biological or artificial bodies which are in perfect condition for himself or others to inhabit, such as the case with Issei.

Quotes

 * "Zoom Zoom Iyaaan. Zoom Zoom Iyaaan." (Volume 12, Life 1)

Trivia

 * Great Red represents Dreams and Illusions.
 * Great Red was born from the "illusions" of Dreams.
 * One of Great Red's titles, "Dragon of Dragons", is shortened to "D×D", referring to the series itself. This can also refer to Issei's new body, as it was created from Great Red's flesh. Thus, Issei shares the same potential title as Great Red.
 * The Red God of Dreams that is mentioned/said in the chant of the Diabolos Dragon God is referring to none other than Great Red.
 * Great Red along with Bova, are the only two characters (as well as the only two dragons) who have delinquent personalities.