Gadra

Gadra was introduced as the Imperial Court Magician of the Eastern Empire and is the master of Razen. He has reincarnated many times so he could master magic. Every time he reincarnated, he would read the treasured books of each royal palace library and build up his knowledge.

Appearance
To Be Added.

Personality
He has been described by Rimuru as a born egotist and that he has no relation to things like loyalty.

Background
He participated in the previous Veldora subjugation and lost his life. Before taking part in the subjugation, he performed a resurrection ritual. He defected to Tempest alongside Shinji and his team, and has been given the guest treatment since. Gadra ended up as the new guardian of the 60th floor and became a hidden boss besides the Demon Colossus.

Trivia

 * He is a Reincarnator. But rather than being a human who died in another world and reincarnated in the current one, he is a native to his world and has instead reincarnated numerous times in order to extend his lifespan using magic.