Game developers from Capcom add Ryu to each Street Fighter game but they never make him too powerful.
The same approach can be found in the Arcade Mode of Street Fighter V. Players face a series of opponents from all over the world and try to defeat them all. In the first games, the game story was only about this tournament. He wants to reach his personal best level and regularly participates in the global tournaments (it’s a very good basis for Street Fighter esports events). Ryu is a Japanese guy who has been practicing martial arts for years. Fans of the franchise can easily feel that they play Ryu in each installment - Super Street Fighter Ryu combos are genuinely the same as in an Ultra Street Fighter game or in another updated version. Still, some distinguishing features of this guy are the same, such as his Hadouken combo. Of course, the Ryu move list changed since then - the franchise and the whole fighting games genre evolved significantly.
The tradition of Ryu moves started from the very first game of the series (the same as with his best friend Ken).