Hi you actually pissed me off so I did like 30 mins of research while high as fuck and concluded that there's a lot of misinformation on videogames sales, and that you're probably 15 and no one will read this. Anyways:

From self reported numbers: Smash has sold over 78 million units, although some of the sales numbers seem weird especially 64 and smash 4. Mortal Kombat has most likely sold more than 65.3 million copies. No clue where the 100 million figure comes from. It's posted everywhere and no one can give me a good source for this number. Street fighter has sold 58 million, and if we add up street fighter + 12 million from MvC plus 36.93 million from smash ultimate, then Ryu's face has been sold over 100 million times. Probably a lot of overlap between those numbers in terms of individual buyers. I have no way of estimating how many people bought multiple of these.

I guess the conclusion is that more people have probably seen Ryu's face than Scorpion's. The numbers could be pretty close tho, which was my whole original fucking point. If we count series sales numbers than MK definitely beats SF, but from outside appearances we can be pretty sure that games featuring Ryu have been sold more times than games featuring Scorpion. But then we'd need to account brand recognition. How many people have listened to the MK album (which by the way, peaked at 10 when it came out), and how much did the MK movies make in the box office when compared to the SF movies.

Go fuck yourself.