Due to the nature of Enstars having most of its characters abused in some way, this happens frequently whenever a character acts in an antagonistic role. It's not meant to specifically single out the abused as abusers, however, there is social commentary at play.
Eichi, Hokuto, Kanata, Hiiro & Rinne, Nagisa, Hinata & Yuta, Rei & Ritsu, Kaoru, Izumi, Arashi, Tsumugi, and Madara all have explicitly bad parents. Some others are murky, but can certainly still be considered for this category (Tori, Souma, etc). Ibara and Kaname are heavily implied to have been abused at their orphanages.
It's talked about how the Aoi twins' father is very abusive towards them. Arashi's family was trash, so is Eichi's, Mikejima got disowned and Kanata's parents convinced him he was a god therefore he wasn't treated like a person. There's much more than just those six characters though.
Kind of?? Shu was previously abusive towards Nazuna and Mika, but they have since collectively moved past and resolved this. Nagisa is implied to be a human trafficking victim, and he frequently talks highly of his late "adoptive father" who isolated him for a majority of his childhood, among other vague and dubious things.
No. There is a few allegations about a character (Mayoi Ayase) being pedophilic, but if you dig deeper into his character it's shown that he has intrusive thoughts about more cutesy things, like his unit mate Aira and his friend Shinobu. In reality he wants to take care of them in a motherly way. But due to some things, those thoughts will turn twisted and he'll blurt them out. He's said it himself that he hates those thoughts too.
in obbligato, near the end, a fight breaks out between the students and tatsumi and kaname are assaulted, with both being hospitalized later and kaname still curently being in a coma
technically yes it is said in the story "Checkmate" (epilogue 1) that Leo Tsukinaga had bit his hands till they bled because he was struggling to even compose anything ( i don't believe it was shown on screen though)
While more explicit references are limited to the Meteor Impact event story, Kanata Shinkai was raised in a cult which would follow cannibalistic traditions in times of disaster. These traditions are explicitly described within the event story, and directly affect Kanata's life at that point of the story, as well as his morals and self-perception during the whole series.
There are also light-hearted gags about cannibalism including Niki Shiina when he is particularly hungry.
One particular scene that references Niki Shiina's father's past during the !! Main Story may be seen as having cannibalistic implications, but it's currently just fan speculation.
not really *burried*, but mika once noticed that ritsu didn't move, so he carried him to the es garden and started digging the ground to bury, but the ritsu woke up and said it was some kind of a joke
Eichi passes out on stage, Kaname becomes comatose (though this is off screen), and several other characters are found passed out throughout the games from exhaustion.
In "Checkmate", a character breaks their arm. Another character gives a pretty graphic description of the event in the chapter titled "A Solitary Throne - 7". There's also a more minor example with Tatsumi having broken his leg in the past.
There are many mentions for comedic effect, but the only "real" instances are in Nightclub when Rinne ties Yuuta up and douses him in cold water, and in Wonder Game when Tsumugi is tied up and roasted over a fictional magic fire
There's a whole cult with cannibalistic sacrifice, Hinata tried to kill himself as a sacrifice for his brother's wellbeing, Rinne and Hiiro have a non-death sacrifice thing
Multiple characters have deceased parents and grandparents, there is a whole story that revolves around Shu’s beloved grandfather dying (he’s not actually dead)
koga used to call arashi "okama bastard" but then he change it to "ari" bc he doesnt like arashi's expression everytime he calls her that and subaru calls arashi "okama". okama means a gay man, in the context of japanese culture, especially to a person who is effeminate and cross dressing
Eichi Tenshouin is often hospitalized due to terminal illness. There are many instances of hospitals being brought up, or characters visiting hospitals for one reason or another. Instances include the beginning of Checkmate, and Tatsumi Kazehaya's mentions of being hospitalized in the past.
There's a couple cases of characters not actually attempting, but it's heavily implied they were about to (Hinata Aoi in Setsubun Festival and Hiiro Amagi in the !! Era main story). One case of a character actually attempting is Kanata Shinkai in Meteor Impact.
In one story in ! (Victoria), one character claims that Shu has "Dissassociative Identity Disorder", but considering Shu's behaviour throughout the series, this is incorrect, as he does not meet the criteria for diagnosis. This seems to be a misinterpretation of the condition on the writer's behalf.
Tsumugi once asked Mika if he was anorexic due to Mika’s poor eating habits. Tsukasa has an issue with over eating that he’s often ridiculed for. In the !! Era, part of HiMERU’s idol story involved Adonis and Souma concerned about HiMERU's weight and eating habits. Though less relevant to his character than the rest, Aira Shiratori is shown to constantly obsess over how much he's eating and how much he weighs.
Hinata attempts suicide in Setsubun Festival. Kanata is implied to have attempted suicide by drowning in Meteor Impact. Tsumugi and Shu are shown to have problems with suicide ideation. In the War era, many unnamed students commit suicide, but nothing is shown onscreen
There are quite a few Autistic-coded characters (Nagisa, Sora, Kanata etc). Some of these characters are insulted or bullied for showing autistic traits (strange speech, unusual interests etc)
In the main story in the second chapter I believe, Mayoi watches Aira from the side of his bed. Mayoi has also spied on characters from the ceilings too as a Yumenosaki Mystery and also in the beginning of the main story. Where he was hidden in the vents due to his anxiety to show up in person. Also a few other times with Madara and the rest of ALKALOID.
In the older stories, Subaru and Koga referred to Arashi as “Okama”. Okama can either be a term to describe an effeminate man or be the equivalent of the derogatory term used to call homosexuals.
Early stories, with Wataru, Arashi, Tomoya, and Hajime being the main targets. Wataru's view since ! era of crossdressing seems to directly challenge the narrative in aspects, Arashi is written with far more respect past ! era, and Hajime willingly wears a skirt for his Feature Scout 1. Tomoya also seems to have far less problems with it past "Spectacular Cinderella".
keito is buddhist and buddhist references are frequent.
eden takes biblical themes, the unit revolves around christian imagery.
ibara challenges the idea of god a lot in response to nagisa's own thoughts.
literally almost half the cast. eden also debuted with the juniors being around 16-17 (mind the fact the unit half revolves around sexually driven fanservice)