Rainmaker

Rainmaker is a Ranked Battle mode in Splatoon that was announced in the Splatoon Direct on May 7, 2015 and will be added in a future update. Nintendo has revealed the mode will somehow use the weapon shown on the right, which appears to be a metallic tiger/fish with a nozzle in its mouth, known in Japan as a Shachihoko.

Recently, it was leaked how this mode will work.

Trivia

 * Rainmaker was first announced in the Splatoon Direct on May 7, 2015. However, its description was extremely vague and only a picture of the Rainmaker itself was released.
 * More details of Rainmaker were datamined on June 21st, 2015.
 * Images of Rainmaker being played on an unnamed stage were revealed in the July 24th Japanese Splatoon trailer detailing future updates.
 * The Rainmaker shoots ink tornadoes like an Inkzooka after being fully charged.