If you read the first chapter then you should know, the main setting of the world Is Overlord. Now thats out the way and with that in mind. Lore,quest, background and more will be told from other games and anime. These will come in as forms of memories to Mc when he transfers, ok moving on to more meaningful stuff, heavy lore that is part oc and part elden ring will be used for certain things so don't be surprised and if some of the magic may not be from Yggdrasil.
For example [triple maximize magic - body of holy flame]
I took the idea of the casting from overlord and the spell from parts of elden ring. I want the Magic system to meet well with the OG writers in a way that makes it work, without taking away the feeling of being in overlord. The magic system will be the same for most people, besides our Mc and ainz, that and a few npc of the Mc and ainz alike.
Ok now then to the Mc, like I said in the synopsis, he is not a human nor the size of one in anyway. But that being said he will get a human form eventually, in the beginning of the story it will be explained why in chapters about getting ready for the new world and while he is in that world why he can't just have a human body.
Another thing is the relationship he will have with a certain character, she is non human as hell and it will be a odd relationship for a while as the Mc will make a dumb ass mistake from overthinking like ainz. Please try to get passed there looks for the relationship, the Mc is not a slime or messy monster he is something I think is bad as alone with the female character.
Now for Ainz, Mc and him will be friends but the Mc will be doing his own thing for a while before he even meets ainz, ps Mc will have children so, if you don't like that sorry, but they won't be a problem in the new world as most will be sleeping or under control.
The Mc will have his own nest and maybe I'll throw a few of his kind in the mix because his castle and npc will be transferred with them so look out for new types of monsters in the world.
I think that covers most of the bs and other things. If I need to explain something to anyone I will, feel free to ask and if for wondered what race the Mc is, you'll have to wait and see as there is a whole big reason why he is allowed to be a creature most characters can't be.
(Thanks for reading)