Okay here's my idea what if a person from our world dies and get reincarnated yes I know classic thing but hear me out but instead of reincarnating in like a place or area you wake up in a cube of sorts and now he have a system this system tells the main character that you need to create a species (live reasonable limits) and if your species went extinct then you will become extinct so he created a slime like species that have two scales still one forever adaptable it's pretty much translate as no matter the environment they will be able to at that into what doesn't kill them I'll make them stronger which as the skill name goes any damage they took in heal up from won't have the same effect compared to the first time they got hit from the same attack now of course they are very weak (for balance you mistake) so now he has to guide his own species to roll over the planet and if he do that he can become God of said planet and conquer / claim other planets afterwards (of course that last part supposed to be for in case you right now of ideas to challenge him later on but that's just the future long story short they seem like a pretty good idea or at least in theory in the funny part is it just pops into my head)(PS says species are not sentient but could gain it over time)
