In this, I will put the MC's discoveries about the Gacha with trial and error and observations.
* Different from what would expect from a Gacha, no useless thing will come like a napkin or a fork. Instead, the limitation is the number of rolls monthly.
-Obs.:It's possible to gain "useless/joke" things if they are named. Like a piece of clothing of a certain character or a book.
* The things gained by the Gacha, follow more or less the power level of the user. But still can fluctuate a lot.
-Sudden growths of the strength of the User will take time for the Gacha to adapt.
* There's some kind of filter in the Gacha that reduces the 'pool' of the things that can be gained based on the User. His actions, character, feats...
* Some things though the process of assimilation doesn't stack. Especially if the power/strength comes from similar sources.
* The process of Assimilation can be accelerated with uses of the power, training or doing things that the Character would do(albeit this is still a slow process)
* Characters weak than the user will be assimilated faster and the stronger ones will be a slow process.
-Max. Time taken to assimilation was Starkiller when the User was a peak human.
-Assimilating fewer characters can speed up the process
- The Sonorosian card, a very strong character was assimilated in 8 days because all the others are assimilated faster and only a slot was being used at that time.
Obs: The Sonorosian card is very strong and has a physiology different from any other thing from the MC. But still took much less time that Starkiller or others because the assimilation process focuses only on it.
* R.E.M. sleep helps with the assimilation process.
* It's still necessary to do things in a proper and boring way with the Gacha. Like holding the cards when used and hold the money when buy Gacha Points.
* When not in a "Package" the card assimilation gives no items. But when summoned, the characters can come with clothes, signature weapons and no-powered pets.
-Using the Background Customization card can make the character be summoned with more things