AUTHOR EXPLANATION READ
Just like my other fanfics this is a place holder and will have one chapter until there's a demand for it and when that happens I'll stack up on chapters reaching until 10 or 20 then post them.
The MC's system works like this.
Every week he'll have to pick three anime/manga and he has to have had some considerable knowledge about the anime/manga to even pick them. In the next following week he can't pick the same one's but in the week after that he can pick them again. And in the end of every month he'll get a random thing from the last character he use's in that month which can range from their luck, Charisma or 'Size' if the next one he gets is the same skill but better then it will replace the previous skill
Next he'll have to roll for the number of the anime/manga and depending from 1-3 and when he lands on said anime/manga let's use Demon Slayer as an example he'll have a chance of rolling from 3 characters he had selected, next he'll have to roll for how long he'll have the characters abilities for from 1 to 10 and a roulette from seconds to minutes to hours to days. And Finally he'll roll on what's the amount of power he'll get which will go from 1-3, one being the same strength as him but still having all their abilities, 2 being half their strength and having all their abilities and 3 being full power depending on what version of the character the mc had placed.
If he rolls the character he won't be able to get the same character on the next pull and will have to wait the second week to try and get them again.
Here's an example
JJK- Kenjaku-2-Minutes-3
That's basically how his System works there's also two side features a quest feature and a pity system.
The quest feature is self explanatory he gets rewards for completing them, the pity system is different.
He will choose 3 characters one from each anime/manga he had placed and depending if he gets them first second or third and so on they will get weaker, but if her gets one of them on his first try he'll be able to use their full power for exactly 7 seconds minute hours or days. But if he gets them last or later on he will have his same strength but all their abilities damage will be maxed out but at the cost of only having access to them for exactly 1 minute.
The Main Characters old name isWilhelm Wright, but now hes Aiku and yes he looks like Aiku from Blue Lock, his current age is 22
And almost forgot, if uses up all his rolls in a single day he won't get them again the next day. So for one week he will have 9 character rolls and remember just because he gets one from a crappy character from a slice of life anime doesn't he'll be weak that's where the Quest System comes in.
He can't just pick any form of fiction and add it to his roulette he has to obtain them from the Quest System, but at the end of each month depending who the last character he used he would get something from them it could be their strength ability or just their taste for food.
Weekly Power Status
-- Power
Ranking 
-- Power
stone