New mechanics have been implemented to Splatoon 2.

Rollers now have the ability to flick vertically upon while in the air and flick horizontally while on land.

Chargers now have the ability to hold a full charge for a short time in squid form.

Dualies which is a new weapon to splatoon entirely, have the ability to roll at least 2 times in a row in quick succession but it leaves the player unable to move for a second or so, but during this time your stance with these weapons change allowing for a more accurate aim.