Joseph

Joseph (ヨセフ Yosefu): is a former test subject that became a hybrid being between an Elf and a. He served the Kingdom of Gleanna as an Esoterologist before later allying himself with Purgatory and created beings such as Renata.

He's part of the Pandemonium Saga as a minor character and minor antagonist of Fairy Tail: Day of Wrath.

Trivia

 * Joseph's appearance is based off Mephistopheles from Frau Faust.