You know, your argument lost steam after the first reference to Dota.
The rest of those games are owned by the same company.
If you're going to try and say that Sailor Moon/Madoka's exact outfits are referred to in much older stories or text, please do say something.
If you want to go ahead and try to play the "hurdur a vague concept or similar game existed so the fact they're stealing art is okay," go to someone dumb enough to compare the two.
Yes, both Goku and Wukong reference the Monkey King. That is perfectly fine, seeing as no major company has any rights to that very very old story.
It's outright illegal, though, if they put Wukong in an Orange and Blue outfit with the symbol for Turtle on the chest. Look at Smite.
And a concept isn't just GENDER/RACE+ROLE.
Why did you make some loose arguments, only to agree with my original point at the end?
All I'm saying is that Riot isn't the nice kind of company that'll actually look at community ideas that are really good, and they even say so.
But just as well, Being the employee who manages a forum for a company does not give you the rights to ideas on it if you leave the company.