Dark Samus

Dark Samus is a nightmarish clone of Samus Aran, who was born at the end of Metroid Prime by stealing Samus' Phazon Suit and absorbing it into herself, the Phazon reshaping her into a mirror image of the Hunter. She is the main antagonist of the Metroid Prime Trilogy, and recently made her playable debut as an "Echo Fighter" of Samus in ''Super Smash Bros. Ultimate. ''Dark Samus is very single-minded and cruel, while being frighteningly intelligent and powerful. She is perhaps the greatest threat of the series, having nearly assimilated the galaxy with Phazon meteorites in Metroid Prime 3: Corruption.

In terms of the MCD Dark Samus has always been quite popular, although user cheetahblades often uses a "Zero Suit Dark Samus" emote to unnerve people.

Trivia

 * Dark Samus is one of TyrantLizardKing's most prominent secondary characters in Ultimate. He still holds some disbelief that she became a playable character at a time long after her story had concluded but is grateful nonetheless.