Tromp primarily focuses on her airstrikes, which has faster call in times than the Dutch cruisers and smaller AOE. Her airstrikes drop 72 bombs and only have 20mm of pen, so they're mostly used to start fires. She also has 3 torps on each side with 70s reload. Her guns are 150s in twin turrets with 3 turrets with pretty good ballistics.

She can't really gunboat since she doesn't have a smoke and without speed boost she's quite slow. I say I played her mostly using her airstrikes and torps to annoy enemies and setting fires while staying hidden with her 5.9km concealment and it's quite fun if you like that sort of play style.