I'm no Roller main, but I've been experimenting with the class for a while. Ninja Squid is one of the better abilities for Rollers, even after the nerf a while back that made you slower. To counteract the slowness, I recommend at least a pure (1 main 3 subs) of Swim Seed along with it. Basically, abilities that allow you to approach enemies without getting killed.
That being said, you will die. I recommend some Quick Respawn and Stealth Jump to get back into the fight quickly and safely. Something like this: