Becoming Superman
Becoming Superman by Michael J. Straczynski.
A lot darker than you'd expect.
Man, this guy had a rough life. The first few chapters where he lays out the (surface level!) history of his family is a tough read, and I could definitely see people bouncing off there. Things get better eventually, at least for the author, but not without chapter upon chapter of reminders that people can be really fucked up. It would've been pretty incredible for Michael to become just a functioning member of society, but the fact he went ahead and became a massive success...