Dark Pit is a playable character in the Super Smash Bros. series. He is from the Kid Icarus series who debuted in Kid Icarus Uprising.
Dark Pit came into existence after Pit destroyed the Mirror of Truth that Pandora possessed. Pandora attempted to side with Dark Pit hoping to take down Pit once and for all but Dark Pit rebelled against her and he actually teamed with his lighter half to take her down. However, Dark Pit soon took Pandora's power for himself allowing him to infinitely fly and goes off to cause trouble.
Dark Pit's artwork from Super Smash Bros. Ultimate
|Super Smash Bros. Ultimate|
Changes from Super Smash Bros. 3DS/Wii U