Re: Character usage limit
Limiting to 4 is the lowest number EA will go too, thanks to team play classes. However, I have not seen numbers above 5 recently, and teams with that didn't work. One of the most effective teams I was on recently had 2-3 Nightcaps, who did almost nothing, no acorns, and was carried by a Sunflower and 2 Citrons.
Not only will a limit prevent players getting attacked by 2 or 3 of the same character at once, it will also make team compositions stronger.