So here's a random thought I had earlier today:
Has Luthor made a will? If so, who does he leave his money and assets to, and how does that inform his character? The man is self-serving to the extreme, so would he have any reason to leave money to family/friends? Does Luthor, Mr.-Pursuit-of-Pleasure, care at all what happens to his wealth once he dies? Does he will his money to different charities, so as to always be remembered as a benevolent philanthropist?
Or would his heirs be capable criminal individuals who will continue his endeavors? I feel like this might not be the case -- Luthor strikes me more as a person who is interested in criminal pursuits simply for his own pleasure, power, and wealth. Why would he care about the good/evil balance when he's no longer here to enjoy the show? Unless he's the kind of man who wants an heir to "carry on his greatness"?