Which of these is NOT a playable character in the 2016 video game Overwatch?

Explanation

In Overwatch, players can choose from a diverse roster of heroes, each with unique abilities and backstories. The characters available for play include Zenyatta, Mercy, Winston, and the rest are support or tank characters. However, Invoker is not a playable character in the game; instead, he serves as a special skin that the player character Tracer can temporarily transform into during certain game modes. This makes Invoker an incorrect answer to this question.