90's kids. Except for the ones who grew up to be hipsters. Walmart employees vs. McDonald's employees.
Unfortunately, Superman; RD's great and all, but I don't think she's made of Kryptonite. Russian Mafia vs Italian Mafia in a car washing competition. (Scousers are people from Liverpool, often stereotyped as thieving bastards)
Rainbow Dash vs. Drawing Sign... Just to clarify in Machs lets just RD (can reach mach 15) and DS (can reach 2x that speed). RD with the increased speed of a double rainboom. Who will win? ~Drawn Signal
I don't know my Norse myths very well, so Hawkeye. Rainbow Dash in an X-Wing vs. the entire Galactic Empire's fleet.
Goku. Godzilla isn't exactly a threat if there isn't a planet for him. The entire state of California vs. The entire state of New York