The Darkside is a Pureblood Heartless and a recurring boss battle in many installments of the video game series, Kingdom Hearts. The Darkside is a minor player in Disney Villains War.
Disney Villains War 2
Vanitas summons a legion of Darksides to fight the opposal enemy, the Twilight Thorn, summoned by Xaldin. While some of them are easily obliterated by the nobody's powers, one Darkside sneaks behind the Twilight Thorn and beats the nobody with a striking punch. As the Twilight Thorn fades to nothigness, Vanitas departs, having finished his fight with Xaldin. As for the remain Darkside, it's fate remains unknown, since it doesn't appear afterwards.
Disney Villains War 3
During the events of the third war, the Darkside appears as a Data Heartless to Clu's work. When Clu is threatened by Abraxxas, he sends the Data Darkside to deal with the assassin programm, while at the same time testing it's powers. The Darkside attacks by punching the programm, with his first. Then it summons Data Shadow Heartless of his own to finish off the programm. However, Abraxxas recovers and evaporates the Data Shadows, with his disc, and then defeats the Data Darkside. It is unknown if it was destroyed or it could still be alive, after the end of the battle.
Disney Heroes Vs Villains War - Part Two
The Darkside is one of the major characters, who are set to appear in the second part of the war.