"Do you remember that time, when I was an ass hole?"
Here it's a topic where we'll talk about heroes who lost their shit for some times in their career.
For exemple, I'll nominate Sue Storm for her time as Malicia, and Tony Stark, for his hard work in douchebaggism during Civil War, when he cloned Thor, allied himself with the Thunderbolts and threw peeps in jail (in the Negative Zone)
* Cyclops --- when he abandoned Madelyne and baby Nathan...
* Namor --- 3rd party in Reed and Sue, now Scott and Emma...
* Wolverine --- 3rd party in Scott and Jean...
* Jean --- Dark Phoenix...
* Emma --- White Queen of Hellfire Club...
* USAgent --- battling and envying Steve Rogers...
* Spider-Man --- unmasking in public, endangering his love ones...
* Daredevil --- possessed by Beast in Shadowland...
* Magneto --- when he was a villain...
Most of those examples, the people were mind controlled by outside influences. Tony and Reed during Civil War, however, there were a couple of misguided dicks. Tony got his comeuppance; I'm still waiting for Thor to shove mjolnir up Reed's backside.
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"I'm not smart so much as I am not dumb." - Harlan Ellison