A War of Spirit
When Link finally obtains the Master Sword, he starts to become overconfident in his own abilities. Sensing this, Cia takes advantage of this and pulls out the darkness in his heart to create the doppelganger out of his shadow. He fights one, but then four more appear, as Link still harbors arrogance in his heart, which also obstructs the Master Sword's true power. Eventually, he becomes trapped in a room where he is nearly overwhelmed by Dark Links, but is saved by his allies at the last minute. Link then realizes his limits and discovers the power of friendship and cooperation (the character of a true hero), Thus, all the Dark Links disappear and the Master Sword shows its true power.
Cia's Tale: Darkness Falls
In Cia's Tale Darkness Falls, Cia summons Dark Links to replace Wizzro and his Icy Big Poes that had defected to Ganondorf's Forces, while Cia descends further into her madness say that the Hero will protect her (meaning she views her Dark Links as if they where the real Link). Cia's use of the Dark Links can also be seen as another example of her obsession with Link.
Wind Waker: Reclaiming the Darkness
Following Cia's defeat, Cia's spirit was captured by Phantom Ganon from the Era of the Great Sea. After stealing the Triforce of Power from Lana and using it to warp time and space causing location from the Era of the Great Sea to appear in Hyrule, he created Dark Cia to siphon and absorbed Cia's magic. Informed by Daphnes Nohansen Hyrule the legendary King of Red Lions, that the one responsible originated from the Era of the Great Sea, Link, Lana, and Tetra journeyed to the Temple of Souls to rescue Cia. As a result of absorbing Cia's magic, Dark Cia gained Cia's power to summon Dark Links. After the Hyrulean Forces managed to drive off Dark Cia and Lana restored Cia's physical form, Dark Cia returned, flanked by two Dark Links. However they proved to be no match for Link, Lana, Tetra, and King Daphnes, who defeated them and their mistress, Dark Cia.
Dark Link also appears as an alternate costume for Link, which is obtainable by purchasing the Hero of Hyrule DLC pack. The Dark Link outfit has the special attribute of effecting the color of Link's weapons to match Dark Link's black shadowy coloration. Additionally it will also turn his Great Fairy and Epona weapons into Dark versions (possessing red eyes and black shadowy coloration) of them. Cia (as a playable character) is able to summon Dark Links with her Scepter moveset.
Dark Young Link
Dark Young Link is the Dark shadowy doppelganger of Young Link from Majora's Mask who appears as an enemy in Adventure Mode. He uses the same moveset as Young Link and can transform into a Dark version of the Fierce Deity.
In Hyrule Warriors Legends, Link's Dark Link costume can be unlocked by completing the True Partners Reward Map (which is unlocked by completing the True Partners Illustration Portrait). Additionally, other Dark Doppelgänger such as Dark Cia, Dark Twili Midna, and Dark Zant appear as enemies in the story. Dark Cia can summon Dark Links as part of her moveset. She also summons two Dark Links to fight alongside her in Wind Waker: Reclaiming the Darkness story scenario.