Sephiroth is a fictional character and the main antagonist of Final Fantasy VII developed by Square. Character designer Tetsuya Nomura conceived and designed Sephiroth as an antagonist to—and direct physical opposite of—the game's main character, Cloud Strife.
What the title says, my friends! Go right ahead and make your own team, whether or not it's your own Avengers or your own Legion of Doom, go ahead and assemble your favorite characters in your own team or teams!