>>132818231I'll spoonfeed you because i'm a massive DIOfag and will take any chance to talk about him.
DIO is extremely ambitious, arrogant, prideful and cunning.
He fights dirty and uses any method to win, but is not a coward and will never run away from a fight.
He's intelligent and manipulative, insanely charismatic to the point that very few characters in fiction can match him in that regard, sadistic and has a high disregard for human life.
He's not an edgelord but at times he goes legitimately insane with either power or rage.
His main trait is his boundless ambition, as well as his drive and willpower to achieve his goals.
So yes, definitely a fun cunning character.