So I felt like I had to place a notice here for all new-coming readers after a few people complained about their favorite waifu's being different or wanting the MC to 'steal' all the women.
This is a MASSIVE HAREM fanfic. Though it won't be a pokemon 'catch 'em all' since the MC won't be cucking people to get their lovers. There will be characters from other anime and manga, especially the various waifu's. IF they are a part of the harem, they will receive very little character development due to the sheer amount of women I'd have to juggle. The only real person to develop will be the MC, though even that is surface level.
The MC is generally a nice person to his friends and those who aren't hostile to him, though he is ruthless in his ambitions, which is why I gave this fanfic the 'Slightly Evil MC' tag. The MC will help people if it doesn't harm him in any way to do so but he won't go out of his way to help strangers.
The main powerset of the world is Skills from "That Time I Got Reincarnated as a Slime' and various magics loosely based around the tier system of Overlord. Martial Arts will come from various sources.
Finally, even though this world is an amalgamation of different fantasy/isekai worlds from various light novels, I will only be referring to manga and anime sources, since I don't have time to read light novels. Once I get past a certain point in the stories that exceeds my knowledge (like after the Walpurgis Banquet in Tensura Slime), I'll mostly be using the wikis for my sources of information, so if I miss something, then make sure to tell me so.
Thought I'd get this out of the way.