How close could they get to a Mario Kled skin without being sued?

Plumber Kled with chroma pack allowing you to be yellow, red, green, or purple! Also changes Skaarls color.

obviously it'd be a homage to mario/luigi/waluigi/wario and yoshi. I'd love to see it.

but... Nintendo is usually uppity about their IP with small-time "for fun" creators, so a well known company like Riot doing it would probably be a legal shitshow.