An Echo Fighter is a term used to describe characters who are considered an almost complete clone of another character but who, themselves, is an entirely different character in general: thus not being classified as a Skin or Pallet Swap. They are featured in Super Smash Bros. Ultimate and all of them will be unlockable.

Characters who are Echo Fighters are denoted by the Epsilon (ε) letter from Greek alphabet in the International version, while in Japanese version is denoted by the Prima (').

Confirmed Echo Fighters