From SmashWiki, the Super Smash Bros. wiki
Shoto or Shotoclone refers simultaneously to:
Since Ken is an Echo Fighter of Ryu in Super Smash Bros. Ultimate, players may use this term refer to both of them simultaneously when applicable, with the term originating from what Street Fighter players call characters derived from Ryu.
Terry shares many characteristics with shotos, such as special cancelling, an energy-based projectile, and automatic stance change to always face the opponent. Therefore, "shoto" can also refer to him.