He is a special class of his own similar to the Prince. I'll just call it Emperor class for now. Older players have used him in the past with the April Fools event and Gold Rush after that. You could see him in action here: https://www.youtube.com/watch?v=9eWG1l439zo
His skill is Sacred Treasure of Adamas (アダマスの神器): (30s; attack 2x; ranged true damage attack; once per battle; AS: ; WT: ; CT: ) which is pretty neat if used correctly. The ranged true damage could get you places in Majin events since they are pretty hard to kill with their gimmicks and all that.