>>531524630
Primary end game is primarily clearing multiple rooms of 300 guys as fast as possible. Most guns do not have 300 bullets in them, and even if they did those 300 mens will be dead by another player's skills before you can even line them up. Fortunately, most characters worth using are coomerific, so this probably won't be a problem.
Secondary end game is shooting maybe 30 guys with a billion EHP each that also has a time limit, and most guns can't do 30 billion damage in 15 minutes, atleast unassisted. Fortunately for you, the characters who can assist guns to this point are all coomerific.

Unfortunately, while there are multiple coomerific characters, only approximately 5 of them are worth using, atleast without a weeks worth of investment. So make sure you use the good coomer character because the bad coomer characters are just not worth it. In particular, never ever pick the big titty ice power brunette as she's the longest character to grind who takes the most investment to be arguably the worst character in the game, even more so than the moids and they're all a tier worse than than the next worst female.

So yeah, what >>531524692 said.