Game Of Thrones: Immortal Reign

Once he traveled through time, he came to the world of Game of Thrones and became the posthumous son of Crown Prince Aemon Targaryen. When he was born, a red meteor streaked across the night, so Jaehaerys I named him Rhaegar Targaryen.
The mother is Jocelyn Baratheon
The eldest sister is the "Uncrowned Queen" Rhaenys Targaryen.
He is the Prince of the Riverlands, Prince of Harrenhal, Lord of the Blackfire, who was personally canonized by Jaehaerys I.
He is the lord of the dragon Galesor, the Nether Star.
He crossed the Great Wall of the North, killed the White Walkers, severely wounded the Night King, defeated the Giant, and was honored as the new king by the Giant.
He is a person that the black and green parties are eager to win over but are afraid of.
He quelled the Dance of the Blood Dragons, destroyed the Hightower family, and ascended the Iron Throne. He was known as the "Bloodhand Dragon King" by the world
He was the leader of the loyal army, the strongest army in the Seven Kingdoms. The loyal army was formed from humans and giants.
He drove Galesos and commanded the loyal army to defeat the Martell family of Dorne, and was called the Conqueror of Dorne.
All, the person standing before the world now is; Rhaegar Targaryen I, Prince of the Riverlands, Prince of Harrenhal, Lord of the Blackfire, Lord of the Loyal Host, Conqueror of Dorne, King of the Andals, Rhoynar and the First Men, Ruler of the Seven Kingdoms and Protector of the Realms.