the MC immerses himself completely in the character for each world to the point where he has no outside personality, especially towards the end, and considers them all to be different, equally valid versions of himself. The ML is a different person in each world and not the usual split souls or hidden god, despite the fact that most of them behave very similar to one another with a couple of exceptions.

none of that matters in the end because "everything is just a story" and the MC only exists inside the book the writer created. As a conclusion to a story, it's just as bad as those stories that use the "it was all just a dream" ending.

I will admit to being disappointed; I feel like I wasted a lot of time reading and trying to figure out the motivation of the MC and search out the overarching plot only to find out there was none. There's no motivation, no reason, and no bigger plot; there is no payoff for the reader, no MC gaining a reward after working his *ss off, no getting together with the ML. There's not even an evil lord god to defeat (there is a god, he's just not evil). All that exists is endlessly hopping from one world to the next and one target to the next with no actual meaning. My final thought was "ah, so this whole story really was pointless."

I won't be rereading this one.

there are very few clues as to the MCs real personality because he takes on the main characteristics and personality of the body he inhabits in each world; i.e. Gloomy, foolish, clever, shy etc. There is no place to show us his own personality, talents, or interests and there's nothing to help link the journey from world to world; no end goal or driving reason for the MC to be doing what he's doing. It feels a little pointless sometimes.

and there is nothing to make me think the ML might be the same person other than the fact that his personality remains mostly consistent. Atm, I'm assuming they are all one person because that is normally how it goes in these novels.

as for character descriptions, there is no physical description. The only thing we know about the MC is that he is beautiful and can't remember his life before the system, though he remembers that he was gay before. The only thing we know about the ML is that he is tall, handsome, and somewhat possessive. That is literally the only description given for either of them, not even hair or eye color is mentioned for any arc, though the MC eyes are sometimes described as clear and shining like stars. It's all very vague.

there's not much to the world-building or characterization so each world is kind of vague and fuzzy. All the female protagonists are green tea b*tches and family members and friends are fairly shallow most of the time, though one or two stand out a little in my mind.