Hero vs. Villain

Heroes vs. Villains is an upcoming Splatfest event in Splatoon 2. It will be held for all regions from 2018-12-15 to 2018-12-16. It was announced on 2018-12-05 on social networks. The results will be given on 2018-01-15.

Details
The Splatfest is a celebration of the release of Super Smash Bros. Ultimate, which will take place on 2018-12-07. The panel image features the following characters that appear in the game, going along with Super Smash Bros. Ultimate's theme of hero-villain pairs:
 * Pit and Dark Pit (Kid Icarus)
 * Fox and Wolf (Star Fox)
 * Mario and Bowser (Super Mario)
 * Donkey Kong and King K. Rool(Donkey Kong Country)
 * Link and Ganondorf (The Legend of Zelda)
 * Samus Aran and Ridley (Metroid)
 * Kirby and King Dedede (Kirby's Dream Land)

Trivia

 * This is the first Splatfest to ever be announced after its successor.
 * The announcement of Family vs. Friends was most likely pushed ahead to before the Version release, due to its unique decor and appearances being in the game files in advance, and previous instances of data miners extracting such information as soon as a new version is released.