Personality
Dio Brando's treacherous, sadistic nature may be partially explained by his abusive upbringing at the hands of an alcoholic father, whom he later killed. He is also ambitious, narcissistic, arrogant and megalomaniac. He will do anything to get what he wants, even if it means trampling people, like he did to Jonathan Joestar when they were young, and relinquishing his humanity in favor of becoming a vampire. However, Dio is not entirely evil, although he tends to approach it. He shows a good side to those who are good to him. In particular, he has shown favorable attitudes towards Enrico Pucci, who also showed loyalty in return. Dio also has a passion for reading, as he is found in the library of his Egypt mansion at times.
Unless provoked or deemed an obstacle, Dio will normally not attack anything or anybody (although probably more out of regarding them as inconsequential, and so not worthy of attention, than anything akin to kindness). He will first try persuading people to work for him, then fight them, if they oppose.