Darkside

Darkside is a recurring villain in the Kingdom Hearts Series. It's a Pureblood Heartless that appears in areas like Awakening, Destiny Island, End of the World, and Twilight Town.

Kingdom Hearts Birth by Sleep
As Aqua is wandering in the Realm of Darkness. A Darkside rises before her, and several more Darksides appeared around her as well. Aqua summons the Master Keeper to fight the Darksides, but she begins to lose hope and decides to let the darkness consume her. As one of the Darksides was preparing to attack her, two shimmering lights destroy them. It was revealed that both Terra and Ventus's Keyblades, Eathshaker and Wayward Wind saved her. Aqua then looks on as the Keyblades disappear from sight.

'Kingdom Hearts'
As Sora progressed through the Awakening, he saw his shadow growing into a Darkside. Sora attacks the giant, but was eventually sucked into its darkness.

The Darkside later attacked Destiny Islands after the Door to Darkness was opened, eventually being sucked up into a dark cloud that loomed above the islands, but Sora was sucked up along with it and transported to Traverse Town.

A Darkside later rose up from the ground below and interfered with the battle between Sora and Ansem while they were at the End of the World. Sora also glimpsed a large number of Darksides within the Door to Darkness before they were all quickly destroyed by King Mickey.

'Kingdom Hearts 358/2 Days'
A Darkside appeared in Twilight Town where it attacked Roxas and Xion. After Roxas defeated the Darkside, he found himself strangely weakened, and his Keyblade was knocked out of his grasp. The blade reappeared in Xion's hands, and then she managed to destroy the massive Heartless in a single strike.

Kingdom Hearts: Chain of Memories
Sora fights a Darkside in the card world Destiny Islands, with the Heartless appearing in a way very similar as encountered his first Darkside. When Riku enters the card world, he too faces the Darkside. Zexion creating a replica of Riku and transforming it into the Darkside to show Riku' "True Nature."

'Kingdom Hearts II'
A Darkside makes a cameo in Kingdom Heart II. It appears in Roxas's dreams of Sora's memories.

'Kingdom Hearts coded'
A Darkside appeared as a data version of itself. It confronted Data-Sora but was defeated by him.

Kingdom Hearts: Dream Drop Distance
Darkside also appeared as a cameo in Dream Drp Distance. While Riku was watching all of Sora's memories so he can he dives into his friend's heart, He saw the memory of Sora facing off against the Darkside that appeared on Destiny Islands.

 

Trivia

 * Darkside is one of the few enemies that appeared in nearly every Kingdom Hearts game.