Vali Lucifer

Vali Lucifer  is the son of the grandson of the former maou and a human woman and the White Dragon Emperor, Issei's Rival. Vali wants to defeat the Great in order to become the strongest existense. He can use Juggernaut by not consuming his lifespan using his enormous demonic energy but can only do so for a few minutes any longer will cause him to go berserk.

A battle maniac, Vali is a powerful fighter and has the Sacred Gear The White Emperor Gauntlet, Divine Dividing, and the spirit of the Vanishing Dragon, Albion, stored in it. His control over his Sacred Gear is better than that of Issei's. According to Azazel, Vali can maintain his Balance Breaker for a month.