There's been a lot of discussion lately about the finality of death in Failtopia, compared to the lore of every other Failboat series, so I decided (because I haven't posted in a while) to sit down and ramble for a second about some specific examples of murderous intent within major characters in this series, and the implications thereof.
First off, the relatively obvious - Mar's the only character with a body count, thanks to the Demon Hunters prequel, and he likely killed more during Season 1 as well, since actual casualties of the Dark Lord seem to mainly just be unfortunate consequences of the typical non-lethal terrorising. It's worthy of mention that Mar was not exactly conscious during these events, any Miitopia Reborn only seems to have a vague understanding of what they've done during their time as the Dark Curse (like memories of a dream, is how I interpret it), but I have no doubt that the knowledge of the blood on his hands is extremely traumatic from him, as it would be for anyone, and it's true in S2 that the very sight of an unconscious body hitting the floor is a tearjerker for him. This is technically because of his Airheaded quirks, but there's plenty of precedent for Miitopia Personality Quirks representing more than they let on in Failtopia. Mar doesn't retain his murderous qualities because he never actually had any, but he technically did do it, probably by the dozens, and his guilt is no doubt a significant reason why he spent three years in therapy and strove to become a world hero after the fact. It's the only way he can make up for his terrible acts of such significance.
Intent to murder is arguably present in every character who fights the monsters, but that's very different and everyone knows it. Demon Hunters, like Simple Bob, are a more debatable case since some of them do appear to be regular people, but as far as I'm aware, the reason the Hunters are a thing is because of more monstrous demons, so that doesn't count either. What I mean by this, are the characters who fully intend to, or actively threaten to, take the life of an obviously sentient being, another Miitopian.
Orion is the first, who wants to kill the GUNie for transfiguring his wife into a Cream Soda Dr. Pepper can, among other food-transfiguration-related atrocities. The GUNie's actions are probably not deadly, but rather more akin to putting people in a comatose state, based on how Orion still considers himself married even when his wife is a Dr. Pepper can, so Orion's revenge quest is not exactly an eye for an eye, but it's extremely understandable nonetheless, and while I did claim earlier that Mar has no murderous intention left, I can't imagine his relentlessness in trying to trap the GUNie in the lamp is entirely unrelated to the fact that his best friend and crush despises and wants to kill the guy. Orion's portrayed as an incredibly kind man who often extends sympathy to people he doesn't know very well, so the fact that the GUNie is able to drive him into such stubborn aggression hardly seen from him outside of battle is a very important detail to note.
Next on my list is Bo, who was hired by the Dark Lord to assassinate Mar in the Realm of the Fey. There's no specific provided reason for this measure, or even why Bo was selected (aside from the fact that "only ghosts can kill other ghosts", as we find out later, and Mar probably counts as one since he's a Dark Curse), so it's discernible that Bo doesn't even know why she's supposed to kill this man, but she's evidently very new to being a ghost and has no idea what else to do with her non-life, so she tries several times over the course of S2E6 to kill her new teammate, to no avail, and she gives up for the remainder of the series. Bo is a character with an absurd amount of secrets she needs to keep, from being a ghost, to being a fake Princess, to being a spy for the Dark Lord, and her being specifically an assassin targeting the leader is a massive one that's certainly looming over her head, due to the added seriousness of the offence compared to everything else (she knows how bad it is to die better than anyone), and the fact that she gives up the work after her introductory episode is instrumental to her growth.
Finally, we have the character that's been brought up tons of times already in regards to the Miitopia Death Lore, because it's actually even more significant to hers than it is to the ghost's - Erica.
She's been part of several failed monster-fighting parties, and most of her former teammates died on the job, and although she's quick to assert that they were idiots who didn't know what they were doing, she's always blamed herself as well, for being the healer of the party who couldn't save their lives (in a sense, she was responsible for their deaths. She "murdered" them.) This was already bad in Season 1, where she's been witness to multiple parties like this and has no faith in the FailFleet Miis at first because of it, but she aids so many more hapless fighters in the Three-Year Gap, only to watch them die out under her care so many more times, that she switches her entire career direction after a severe breakdown, and pretty evidently has PTSD from these ordeals throughout Season 2. Some of the coolest moments in the season come from her being able to channel her struggles into her fighting and avenge her unconscious teammates with absurd feats even by Miitopia's own gameplay, but that's never made into a joke, nor is it ever said that she's dealing with it in a healthy way at all. She constantly makes murder threats in Season 2, mainly in her first few episodes, which are treated as jokes, but it's because the point is that she delivers them like she means them when it's also obvious she doesn't. It's a projection, she's trying to make herself seem threatening to ward off making any more significant connections that could fall apart at any moment, due to the vice grip the concept of death has on her, and it never actually works, her teammates still care about her after all of it. Erica's always depicted in a pretty terrible mental state, but her unending kindness for those she eventually trusts and badass Warrior moments stack on top of that to make her the fandom-wide beloved character she is, and the exploration of how significant death is to her history, and the murder threats she resorts to being played as jokes because it's never treated as believable that she would actually do something so awful, is a very large factor in that.
In short, resurrection being a common thing in this world would make a lot of thematic elements in Failtopia fall apart at the seams, and even the idea of it being for Special people undercuts several key elements, like the attempted Mar assassination because in what world is he not considered Special?