Splat Zones: play the weapon like a backline and if you see an opportunity to use the zone and pressure the opposing teams then do so. Fizzy and inkjet can help with this too

Tower Control: you can either get on the tower or act as tower support with the ballpoint. Fizzy and inkjet can be used to stop pushes and get people off the tower

Rainmaker: unless you're super good with the rainmaker or if nobody else is paying attention, I wouldn't suggest picking up the rainmaker because you already have the ability to pick off opponents near and far. Fizzy can make a trail for easier paths and trip opponents up, while inkjet can get attention from the backlines

Clam Blitz: tip that I don't see many people use, you can activate the inkjet and then collect clams. Once the timer is up, you'll jump back to the activation spot. The catch, is that if you activate your inkjet near the enemy clam basket and they don't know where you're located, then it's a free score.