This bad boy is the Heavy Splatling. The mechanics are similar to those of a charger, but it’s in a class of its own. Compress your ink, then release to unleash a fat stream of ink from the cannon. Each charge uses a huge amount of ink, and charging it leaves you exposed for a while, so play smart. This set comes with the Sprinkler sub and Sting Ray special.
— Squid Research Lab
Source: Splatoon’s Tumblr.
…Wanna play? Buy a Switch.
And if you’ve already got yours, click on Splatoon 2 for everything you need to know about the game. 😀