If you proceed further into the game, you eventually get to Cerberus. Like the other Overlords, Cerberus can either kill Trillion and live, or die and get murdered by Trillion.
Perpell, Ruche, Elma, and Fegor have special cutscenes in their respective “Hot Springs” event. Their respective cutscenes show them in a see-through towel. As for Perpell, she is completely nude with only steam censoring her upper body.
While there is no eye mutilation, one of Zeabolos’ eyes are completely red due to Faust’s best efforts to put his body back together after dying to Trillion.
Every Overlord besides Cerberus is female, and once they deliver their finale attack to Trillion, you hear them get brutally murdered before getting eaten.
Every Overlord that dies against Trillion gets a heartbreaking scene of them getting repeatedly stabbed before getting eaten by it. This isn’t shown on-screen, but you do get to hear it.
Every ending except for Levia(Childhood friend/Not related), Cerberus(Pet/Not related/Non-romantic ending), Faust(Not related), and the True End have incestuous undertones. With Elma’s ending having her straight up say that she wants to be Zeabolos’ bride, and Fegor sharing a kiss with Zeabolos.
Perpell, Ruche, Elma, and Fegor all take the form of children(Fegor looks moreso like a teen), and they can be killed off to further progress in the game.
About a week/cycle or so before Trillion awakens, you get a scene where the Overlord awakens their “Death Skill”, this scene contains the Overlord’s crest appearing on the screen.
Death Skills(especially Final Strike) also contain many visual effects on screen.
When Zeabolos talks about his fight against Michael, he mentions that Michael delivered a serious blow to his throat that gave him a wound deep enough to spray blood all over the field.
1. The scene where Overlords awakens their Death Skill in training contains an “electronic, siren-like”, but this sound is replaced halfway through the story with a less screeching noise and replaced with a more “magical-like” one.
2. When an Overlord dies, you get to see how much land Trillion consumes afterwards, thus making you hear a “chomping” sound, a “buzzer” sound, and some other miscellaneous sounds during this.
Most characters are close to Zeabolos’ age, but Fegor, and Elma are younger than him physically. And while Elma is younger than him chronologically, Fegor is older than him chronologically.
Astaroth, Perpell and Ruche’s father, dies fighting Trillion in the first cutscene of the game. Meanwhile Zeabolos mentions that he lost both of his parents.
Zeabolos was unconscious for a while before he awakens in his room, this is the scene (after his death against Trillion) that kickstarts the events of the game.