Hmmmmmm.
Let's see. Aquaman already has THE trident of Poseidon and that Hecatoncheire armour so he has plenty already on his own.
Joto/Slagger/Hotspot could do with some other abilities tied to his pulse. Maybe with with practice he gains the ability use the pulse to create shields that protect him and others from projectiles by flash evaporate anything that touches it.
All the team members of Soyuz just need upgrades to range and stamina of their powers.
Tsunami and Blue could gain the bulletproof hide that all the other undersea people's suddenly have.
Canary already has a built in plot device for scream upgrades tied to her Shiva training. Maybe that add the skill to create a focused low decibel shield to repel bullets giving her some crowd protection powets