Thread:TheDigger1/@comment-27109830-20160603174331/@comment-26220697-20160603181131

Riku vs. Cecil Harvey (Final Fantasy): White-haired swordsmen from games made by Square Enix, who were once controlled by the darkness, but escaped, and now fight using a combination of darkness and light.

Xemnas vs. Pain (Naruto): Leaders of villain groups who are known for wearing black cloaks, and who're made from the bodies of people who sacrificed themselves for their friends, with Xemnas being the soulless body of the Xehanort-possessed Terra, and Pain being Yahiko's corpse controlled by the Rinnegan.

Axel vs. Renji Abarai (Bleach): Red-headed, spiky-haired, cocky members of powerful groups who started out as antagonists. Both of them had some sort of grudge against the main characters, Renji due to Ichigo beating him and Axel due to Sora being the reason Roxas isn't around anymore, but eventually come around to joining them. They both enjoy fighting, and primarily use bladed weapons during combat. When going all out, they both also surround their enemies with a ring of death, Axel's being made out of fire and Renji's being his Bankai, which they use to cut off their opponent's movement.

Roxas vs. Starkiller (Star Wars: The Force Unleashed): Copies of the original protagonists who the villains hoped to use in order to achieve their goals, though they ended up rebelling against them and following their own path. Both of them wield incredibly powerful swords, and fight using a dual-wielding variation of the style used by the person they were made from.

Demyx vs. Aaroniero Arruruerie (Bleach): Water-manipulating villains who are seen as the weakest members of the organizations that they're a part of.

Vexen vs. Szayelaporro Granz (Bleach): The main mad scientists of their respective villainous groups, who, despite not being as strong as their teammates, are responsible for making most of the useful inventions used by them.

Larxene vs. Phosphora (Kid Icarus): Blonde, lightning-manipulating females with a quick wit who love to mess with their opponents.

Young Xehanort vs. The Masked Lumen (Bayonetta 2): Younger versions of the main villains, who were brought to the present to assist the other villains with their plans. Both wear long cloaks, can manipulate time to some extent, and wield bladed weapons that can be combined into a singular weapon.

Terra vs. Anakin Skywalker (Star Wars): Former apprentices to wise masters who were tricked by the elderly villains of the series to succumb to their inner darkness, with Terra becoming Xehanort's new host body, and Anakin becoming Palpatine's most trusted warrior.

Vanitas vs. Dark Pit (Kid Icarus): Clones of the main heroes who were created by the villains out of the inner darkness of the heroes in an attempt to create a servant who could match them. While Vanitas was a success in that regard, Dark Pit betrayed the Underworld Army and eventually joined Pit as an ally

That's all that I can remember at the time.