RYU – HADOKEN
Anyone who’s played Street Fighter for 10 minutes can throw a Hadoken. Even if Ryu is in a different game, the command and the effect of his fireball stay the same.
Several characters in the Street Fighter franchise have their own Hadoken or similar attack, even if they’re not throwing energy beams. And one of the first things new players learn is how to counter a “Hadoken spammer” in online matches.
This move influenced fighting games so much that not giving the main character a Hadoken-like move with the classic quarter-circle-forward motion is rare. That blue ball of pain is one of the most iconic moves in fighting game history.