"I'm not [insert bad character here], I just stole their body lmao. Kinda a skill issue tbh." 

Other characters def won't believe the transmigrator, but will quickly change their mind when they don't recognize family and ask about basic stuff like where's the bathroom

Pretty standard stuff so far, but the twist is that the protagonist is like the final fantasy version of a dark knight and purposely uses the system to damage themself in combat to transfer that damage to their enemies/ power up their minus strikes

Also the protagonist doesn't even bother trying to stay in character to the system's chagrin. Protagonist could also have masochist qualities

In the heat of combat the protagonist would say something along the lines of "I think commoners deserve rights" and then their opponent starts screaming in agony because they now know what 50,000 years in the vivisection pit feels like

You know that trope where a group of nefarious people pretending to be adventurers lure innocent people into dungeons to rob and or kill them? The evil "adventurer" was a part of one such group trying to scam the conspiracy theorist.

The conspiracy theorists "crazy ramblings" turn out to be true and the outlaws are caught up in the conspiracy with the evil "adventurer" being the only survivor. Now the conspiracy theorist and the evil "adventurer" have to work together to survive and stop the kingdom from being ruined

The reader wouldn't get the perspective of the time looper. Every time the side character/orginal story's protagonist dies the story goes back to the first paragraph. Maybe in the first few loops the protagonist doesn't even get to encounter the looper because they die to quickly or something. Just background details change

Maybe the protagonist develops a psudeorng randomizer thing they do immediately upon reset so loops aren't stale to the reader and to throw off the time looper. Like they have other characters around them do a series of dice rolls or coin flips to determine how the protagonist acts. The butterfly effect basically guarantees the protagonist acts differently each loop because the loopers actions will cause the dice rolls to happen at different times thus leading to different results. 

The protagonist uses their time loop regression ability to find a path where NOBODY dies in the Apocalypse. Even the monsters coming from the portals are talked down and spared when possible.

Rather than some cold and aloof badass the protagonist is a incredibly warm and friendly philosophy/ethics student. The story doesn't just say "murder bad", it gets into the weeds and explains WHY murder is bad. When confronted with an enemy that views humanity as lesser and cattle, the protagonist actually confronts that view and proves them wrong

Also despite solving most problems with words, the protagonist isn't weak. I think it'd be funny if the protagonist intimidated an eldritch god/demon into being his best friend. Also the protagonist will point at people he befriended in previous loops and loudly shout "FRIEND" at them upon meeting them again for the first time. The confuesed, reacquired bestie will have no say in the matter.

It does that trope where the guide/tutorial entity has the authority to kill 1 person to set the mood, but there's a whole arc about saving the cannon fodder guy who gets obliterated

The protagonist over time start to develop emotions and falls in love with the original host's personal maid. The maid is basically in a kobeni situation where they have comical amounts of plot armor

Bonus idea #1, the setting could be a modern romance novel with zero magic/cultivation elements. The only supernatural element is the system so other characters freak out when they notice the protagonist is doing things that should not be possible

Bonus idea #2 the police/authorities could be a major threat to the protagonist. There could be a major focus on the protagonist's efforts to avoid capture. Stuff like constantly having to wear a mask, using sewers/underground tunnels to travel around, and having to deal with city wide security cameras. What the protagonist has to do to stay hidden makes them miserable

Bonus idea #3 the protagonist could maybe be pretty open about the fact that they have a system. They inform their victims that they are not commiting these atrocities out of their own free will. The protagonist refers to the system as a demon around other people. Bonus idea #1 could perhaps convince the other characters that the protagonist is in fact actually being controlled by a demon since magic shouldn't be real

A major inspiration for this story concept was a game called life eater

 Don't worry, none of the chapters are getting deleted, and any changes I made to them are miniscule. I also totally promise that Arissa will keep slowly getting less annoying and more assertive, although it's still gonna be quite gradual lol. Hopefully sometime during this month the next chapter will come out, and hopefully it won't disappoint you :P

I am feeling cautiously optimistic about this

Wait its back to rising

Now its back to well-kown? This thing needs to make up its mind