Great Red

Great Red also known as the Apocalypse Dragon, the True Red Dragon Emperor God, True Dragon, and the Dragon of Dragons, is the most powerful Dragon in existence and resides in the Dimensional Gap.

Appearance
Great Red is a massive red Western Dragon with a horn on his nose. His overall length measures around 100 meters. He is the second-largest Dragon in the series, after Midgardsormr.

Personality
Not much can be deduced on Great Red's personality, but Issei compared his personality to that of a bike 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. 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, while saying "Zoom Zoom Iyaaan" (from Oppai Dragon's theme song) over and over to Issei and Ddraig's dismay.

Powers & Abilities
Being the most dominant being in existence, Great Red is immensely powerful. He lends Issei a portion of his powers, which gave Issei incredibly destructive powers that were even capable of destroying a part of the Underworld without leaving a trace. Being an existence with the power of dreams, Great Red can descend into people's thoughts and turn dreams into reality. 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.

Quotes

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

Trivia

 * Great Red represents Dreams.
 * Great Red was born from the "illusions" of Dreams.
 * Great Red is actually a reference to the Biblical Satan in Revelations 12:3, where he takes the form of a seven-headed Dragon.
 * Great Red has a fondness for the Oppai Dragon theme song.
 * 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.