It's kind of interesting that many comic book heroes and villains have experienced trauma and appear to have some symptoms of PTSD. Bruce Wayne (Batman) is the one I relate to the most, as he witnessed the murder of his family and then became a recluse, obsessed with caves and darkness. He's only able to be outgoing when he wears a mask and is disguised as Batman. He continues to suffer from nightmares, flashbacks and hallucinations, and has trouble getting close to anyone. The Punisher was a Marine in Vietnam, and witnessed the murders of his wife and children at the hands of the Mafia. He has frequent flashbacks and nightmares of his family's murders and has trouble controlling his rage. Magneto (X-Men) is a Jewish Holocaust survivor. His entire family was murdered by the Nazis, and he was tortured while in camp. He married a Gypsy woman who he met in the concentration camp and had a daughter with her. His infant daughter is later murdered by a mob, which causes Magneto to lose his sanity. He has many symptoms of trauma which effect how he acts as a supervillain. Wolverine (X-Men) witnesses the murder of family members and his mother's suicide. He loses all memory of his childhood, his family and his name, due to his trauma. V (V for Vendetta) is held captive in a concentration camp in a dystopian future. He spends years there, tortured and experimented on. He finally escapes and becomes a recluse, wipes out his former identity entirely and exacts revenge on those who harmed him. That's just a few characters I can think of off the top of my head but there are many more.