Suffering extreme grief and loneliness from the loss of his parents, causing him to become promiscuous in order to fill the hole in his life. 

Abandoned by his family and his best friend after being turned into a vampire against his will. His father chases him away at gunpoint and Al is left to fend for himself for years by living as an animal drinking blood from a slaughterhouse.

Abused by an ex-lover.

So traumatized by the death of his sibling that he has wanted to die for CENTURIES. Even when he develops amnesia and can no longer remember why he is traumatized, his desire for death remains strong.

Molested over and over as a child because his family gave his abuser permission to do so.

Witnessed his father molesting his step-sister and the shock caused him to become impotent.

Being isekai'd to another world sounds great and all, but the joy dissipates quickly when you are captured upon your arrival and forced to spend the next several years as a sex slave, nearly dying from abuse and neglect.

Cursed as a young man and forced to carry the burden for many years.

After a domestic terrorist blows up a building with his little girl inside of it, D goes down a dark path and becomes a hit man for hire.

A great tutor can change a child's life. A shitty one tries to sell his student to perverts and gets killed by said pupil as a result, leaving the traumatized youngster to spend years dealing with the emotional baggage. It's no wonder poor Eiri comes off as an emotionless dick half the time.

This guy takes 'traumatic past' to a whole new level, as his trauma has spanned many lifetimes. Every time he meets his past love in his new life, he dies!

Became unable to speak in a loud - or even normal - volume after someone told him during sex that male voices were 'disgusting'.

Mentally scarred from sexual harassment he experienced. Not only does he have androphobia, but he also suffers from a serious case of stuttering.

Afraid of bright lights due to nearly being hit by a truck as a child.

Afraid to be near small animals after being traumatized as a child when he awoke to his vampire nature and bit his dog.

Hates alpha due to one betraying him in the past, luring him to an apartment where he is gang-raped.

Abandoned by his mother, left to sell his body to support himself, repeatedly raped, and bullied to believe he will never cause people anything but pain. I want to take this poor kid home and cuddle him myself.

When we think of rape-induced trauma, 99.9% of the time it's referring to the victim, not the rapist. Omegaverse turns that on its head when alphas are literally unable to control their actions and are traumatized when their sanity returns and they learn what they've done. Such is the case here.

Another traumatized rapist living in alpha-rut-hell that only the omegaverse could produce.

Abandoned by his mother when she could no longer stand being used as a prostitute by her own husband, Hyesung grew up frightened of his father and distrustful of alphas in general. He also feared he would not be a good parent due to the terrible upbringing he had.

Was injured and orphaned in a car accident as a child, causing Hyunwoo a number of health issues and a fear of riding in vehicles.

Traumatized by the death of his father, blaming himself for what happened.

Abandoned by his mother as a child.

Ostracised for being gay when he got caught kissing a boy in school. The boy turned against him to avoid being ostracised himself, and the trauma made him afraid to express himself when he finally falls in love again.

His parents were killed by werewolves and he was later brought along to a violent battle between werewolves and humans as a teenager, where he passes out from shell shock.

Traumatized by the death of his parents, causing him to not leave his house for five years.

Forced to have sex with a relative and made to have an abortion when he became pregnant. Because omegaverse.

Physically and emotionally abused in the past by various people forcing or manipulating him to fulfill prophecies.

Developed a traumatic fear of the sea due to being locked in a shack in a seaside town where he was forced to be a sex slave.

Suffering from insomnia and PTSD due to a traumatic early childhood experience.

Witnessed his omega father be violated by strange men over and over as a child. He has no idea who his alpha father is.

Chosen to be a sexual sacrifice due to his hair color. He was groomed from birth to be confined and sexually abused, with his molestation beginning in childhood.

Was bullied in middle school and now as an adult remains shy and cautious of the people around him.

Became aphasic after witnessing his parents' deaths as a child.

Cruelly abused as a child by a man who forced him to be his "pet".

Was the one to find his boyfriend's body after the teenager committed suicide.

Sold into slavery as a child, kept in isolation, and wasn't even taught to speak until his owner's son discovered the horrible conditions in which he'd been living.

Was in a BDSM relationship with an abusive partner, causing him deep trauma.

Traumatized by a large dog, he has had a fear of them ever since. 

Hates dentists after a very traumatic visit to one when he was young.

Unloved by his parents, who eventually die leaving him alone. Nanami becomes so desperate for affection he actually falls in love with a man who buys and rapes him.

Betrayed by an ex-boyfriend and gang-raped, causing him to now have an extreme reaction to male smells.

Gang-raped in high school, and since this an omegaverse story, he wound up pregnant as a result.

Lost his unborn child, was abandoned by his mate and spent a year isolated and alone due to his uncontrollable pheromone disorder.

Impotent thanks to a traumatizing event back in middle school.

Haunted by the death of a dog he loved as a boy due to unloving parents and also was abused in the past by his brother. The result? This guy's got a fuckton of mental issues and can't stand being touched by people.

Abused and neglected in his past life until he finally dies. Is a slave in his current life until he is rescued.

Was raped back in high school.

This guy has eight lifetimes worth of trauma. His boyfriend loses his memory of him and dies every time they are reincarnated. 

Was assaulted and suffered a trauma that made him afraid of human touch.