Lex Luthor

Lex Luthor is the former CEO of Luthor Corp, the archenemy of Superman and the adoptive brother of Lena Luthor.

Early life
After Lena was adopted in to his family, Lex made her feel especially welcome.

Villainy
For unknown reasons, Lex declared war on Superman, committing unspeakable crimes in Metropolis, to the point to set off an earthquake in California, which was tended to by the Kryptonian. Eventually he was brought in by Superman himself and subsequently incarcerated for 37 consecutive life sentences.

After Lena took over Luthor Corp, with plans to rename it to L-Corp, he hired the assassin John Corben to assassinate her. However, Corben was eventually nearly killed before being turned into Metallo by Cadmus, headed by Lex's mother.

Personality
Lex is cold, self-righteous and delusional in his views, declared war on Superman simply because he is an alien, regardless whether or not he is a threat to the human race, committing unspeakable crimes in Metropolis, to the point to set off an earthquake in California. Lex is also unstable, as he hired the assassin John Corben to kill his adoptive sister, Lena, simply because she was going to rename the family company from Luthor Corp to L-Corp; implying that he is proud of his family name.

These negative traits of his are what eventually led to Lex's deserved/justified incarceration.

Legacy
Lex's imprisonment is part of the motivation of Lillian's vendetta against aliens.

Behind the scenes

 * Lex Luthor first appeared in Action Comics #23 (April, 1940) and was created by Jerry Siegel and Joe Shuster. He is considered to be the intelligent and ruthless archenemy of Superman. He usually appears as a brilliant scientist and sometimes corrupt billionaire industrialist, with personal vendetta against the Man of Steel. Even though he has always been a controversial figure in the public eye, he has also maintained political popularity, once serving as the President of the United States.