This time, it's Druid. She doesn't really have burst of damage (except when you get ruby special upgrade), but she has pretty good sustained damage.
She is also pretty simple, but in a different way from Heavyblade. While Heavyblade is simple in how you play, Druid is simple in how you move around.
You want to use the secondary and special abilities in between primary, but since she doesn't have any resets, you have a pretty static rotation. And other than secondary, the attacks aren't going to miss unless the boss moves really fast.
This means there's not much reaction involved with Druid gameplay, so you can focus on movement and positioning for mechanics. Her defensive also helps a lot in that sense. So I guess I'd recommend Druid for people who have hard time dodging bullets and mechanics.