There’s a unique role for all playing in 4 vs 1 matches.
The team at MercurySteam has released the first developer diary for Raiders of the Broken Planet (embedded below). The video focuses on the character of the Antagonist, a unique role in the asymmetric multiplayer matches.
The player that joins the match as the Antagonist will be able to see which heroes were selected and choose the one from the whole roster that’s best suited to oppose them. There are various other mechanics that will result in each match being a somehow unique experience. Take a look: