Mario should be as traumatised as fuck.
-Mario was artificially engineered/enhanced by some higher being(s) as a Star Child - born with "an EXTRAORDINARY amount of power) (Yoshi's Island DS). He could (and did) kill from conception via a Power Star (Yoshi's Island 1).
-At a young age he was swallowed whole by a giant frog and shat out (Yoshi's Island 1). He also suffered when a local felon, Burt (the "Bashful", supposedly) exposed himself towards him (Yoshi's Island 1)
-He was the victim of several attempted kidnappings and assassinations before he was even "born" (Yoshi's Island games)
-In his infancy, he has been repeatedly travelled in time to play sports and racing against his future self (Mario Kart/Sports series)
-He was engaged in combat during an alien invasion while a toddler (Mario & Luigi Partners in Time)
-In unclear circumstances, he was relocated from the Mushroom Kingdom to Earth (Donkey Kong)
-He served in Vietnam (Mario's Bombs Away) specialising in explosive weaponry in the field. As a trained Doctor (Dr. Mario series), he presumably also served in a medical capacity, dealing with wounded soldiers and facing death on a daily basis.
-He had to repeatedly battle an out-of-control ape, the trauma of which seeminly destroyed his relationship with his partner, Pauline (Donkey Kong).
-During his miserable existence in the Mushroom Kingdom, he is forced to act out a grotesque repeating theatre of rescuing a repeatedly-abducted monarch from her political rival (Super Mario games), with the knowledge that the monarch in question is fully capable of freeing herself (Super Princess Peach) and presumably does it all for attention. Even in his dreams, he has no respite (Super Mario Bros. 2)
Potential PTSD. Repressed trauma. Exposure to violence and conflict during infancy. Disruptive and chaotic upbringing. Exposed to the horrors of war. Disturbed relationships. Sleep disorder. Killing others throughout childhood.
It's actually amazing he hasn't killed more.