Rostiello was born to a family of mages who travelled the countryside, teaching the arts of splendor and demonic magic to the local populace. Rostiello spent his early life roaming the countryside with his family, practising his magic and learning about the world around him. He has fond childhood memories of playing with his friends in the fields and riding his pony.

As a young man, Rostiello worked hard to make a name for himself in the magical community and eventually achieved great acclaim as a mage. However, the pressures of his career began to take their toll on Rostiello and he began to develop a dark side. He began to take pleasure in torturing and terrorizing his opponents on the magical battlefield.

Eventually, Rostiello became known as one of the most psychotic and dangerous mages in the multiverse. Although his life is full of danger and excitement, Rostiello is ultimately a lonely man. He has no friends other than his work and he spends most of his time fantasizing about the beautiful women he's seen on his travels.

In his mind, there is nothing more fulfilling than conquering a beautiful woman and making her his own. Although Rostiello has never been married, he has had several sexual affairs. He is currently employed as the head mage of a major city in the middle of the empire.

He lives in a sumptuous mansion and enjoys caviar, fine wines, and the company of beautiful women. His life-defining event was when he was able to defeat an ancient demon king and claim his crown as the most powerful mage in the multiverse.

Although he is extremely proud of this accomplishment, Rostiello is also plagued by feelings of guilt and insecurity. He knows that he is capable of much more than he has achieved and he dreams of one day achieving even more power and brilliance.

Rostiello's main flaw is that he is too consumed with himself and his own ambitions. He is never satisfied and he always craves more power and recognition. Although he is a talented mage, Rostiello's main skill is political maneuvering and he is not the strongest fighter in the magical community. He relies heavily on his magical abilities to defeat his opponents.

Rostiello's dream is to one day find a way to merge his magical power with that of his best friend, a powerful demon hunter, and become the most powerful mage in the multiverse. Although this is an incredibly ambitious dream, Rostiello is never deterred by the challenge. He has a fierce determination and a burning desire to achieve the impossible.