One thing about your main that other players do not know ?
I main Riven, and I get triggered when I see people playing her without training and perfecting her animation cancels or the fast combo. I can always tell the difference between a bad, good & godlike Riven player from the way he uses her animation cancels.
For you who don't know, Fast vs. Regular combo
What about your mains, what do people do wrong playing them ?