This side of him comes from the extreme abuse and persecution that Vali suffered at his father's hand. Vali does possess a more vulnerable side, a side that he almost never shows. Vali shows a proper attitude towards beings that deserve respect. Unlike the other Old Satan descendants, Vali has absolutely no interest in supporting the world domination ideals of the Original Satans like Shalba, Creuserey, and Katerea. This is most likely due to his childhood where his father, whose fanatical pride as Lucifer's grandson, was one of the two factors that led him to abuse his own son due to having greater potential than himself. Additionally, Vali does take some pride in being the descendant of the original Lucifer, but not in the same arrogantly fanatic extent as the other Old Satan descendants.

He is known to be a prideful young man like his grandfather and a battle maniac, being obsessed in finding strong opponents, and having said that he would gladly welcome death if there was no one strong enough for him to fight. Wielding the Longinus 'Divine Dividing' and his demonic powers, he refuses to use any other weapon besides the two, owing to a strong yet somewhat stubborn confidence in his capabilities. While initially appearing to be a cold, arrogant, overconfident and ruthless person, Vali has a calm, noble, and caring side in him as he cares deeply for his comrades. Vali's height is 168 cm (5 feet 6 inches) and body weight is. Vali also bears a great resemblance to his grandfather, Rizevim Livan Lucifer. However, unlike other Devils, he possesses a total of eight.

As with other Devils, Vali has black bat-like wings on his back. He also wears burgundy jeans with a silver chain drooping down over them and black leather chaps with three bands encircling his right calf, and black shoes with black buckles. He is often seen wearing a dark green V-neck shirt with a high-collared black leather jacket over it. Vali is a handsome young man with light silver hair (dark silver in seasons 2-3) and hazel eyes (light blue in seasons 2-3).

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