Digital art for 10-15 posters

Hello there! We work at a youth club, where kids and young adults between 10-23 can attend different activites. One of the activities are various types of gaming. Fortnite, CS:GO, Overwatch and mixed gaming. In our gaming room we have a big (think 20 m) long white wall we want to decorate. That's where you come in! We want different characters from different games rendered in the same digital art design, so we can make some awesome posters. We are thinking about 10-15 characters - we will of course provide reference pictures and answer additional questions. The most important thing is that there is some sort of "red-string" through the different posters - the art design. The posters are gonna be pretty tall, probably 2mx1m or something similar. We have a fairly stretchy budget, so let me know what your ideas or twists are. I have uploaded some files of possible characters, we will figure out the exact figures/characters once we have decided how many exactly are needed. Hope to hear from you!