Dark Samus

Dark Samus is the main antagonist of the Metroid Prime subseries of the Metroid series. The creature, a doppelganger of Samus Aran, had initially been the creature known as Metroid Prime before the latter ended up defeated by Samus on Tallon IV.

Super Smash Bros. Brawl
Dark Samus's debut into the Super Smash Bros. series is as a collectable trophy and sticker in Super Smash Bros. Brawl. She also appears as an opponent alongside Dark Link in the Event Match Battle of the Dark Sides (although in that particular case, she was depicted as simply a dark silhouette of Samus). The sticker gives an 11+ increase in resistance.

Super Smash Bros. for Nintendo 3DS / Wii U
Dark Samus appears as an Assist Trophy in Super Smash Bros. for Nintendo 3DS / Wii U, where she utilizes several attacks from the Metroid Prime series, including her scattershot. She can also be "attacked" to a certain extent, having her flinch if hit. Once she's done, she lifts her arm cannon up slightly before vanishing. She also is referenced in one of Samus Aran's palette swaps.

Super Smash Bros. Ultimate
Dark Samus is set to debut as a playable character in Super Smash Bros. Ultimate as an Echo Fighter of Samus. Dark Samus shares the same moveset, but with different properties. Dark Samus also floats in a fashion similar to Mewtwo.

Charge Shot
The Charge Shot is Dark Samus's standard special move. It can be charged like Samus's, but it is instead colored black rather than blue.

Missile
The Missile is Dark Samus's side special move. Like with Samus, she can shoot regular Missiles or Super Missiles, though her Missiles are green, having been infused with Phazon.

Screw Attack
The Screw Attack is Dark Samus's up special move.

Bomb
The Bomb is Dark Samus's down special move.

Final Smash
Dark Samus's Final Smash is similar to Samus's Zero Laser, though it is colored black rather than blue.

Trophies
Red indicates exclusive to the Nintendo 3DS version. Blue indicates exclusive to the Wii U version.