Echo Fighters are a type of fighters in Super Smash Bros. Ultimate. They are the official terminology used for what was referred to as the "Clones" in the past installments of the Super Smash Bros. series. The main difference between Clones and Echo Fighters is that Echo Fighter are strictly an official term and only Nintendo can declare characters as such. Their number is the number of the fighter they are based on but with a Epsilon (ε) symbol right next to it.