The Red Storm look pretty vicious looking (they are one of my favorite demons in the game) but if you can get rid of them before they can attack, you'll be just fine. You will need serious lightning resistance to go toe to toe with these guys, as that is their favorite weapon. Also, Fireball, Flame Wave, and maybe even Wall of Flame should be your primary weapons against these guys, as they aren't very fond of fire-based magic.

Warriors that have lightning resistance should do just fine against these guys. He will take some hits, but as long as hes got the potions, he'll be fine. The Sorcerer, on the other hand, may not have as much fun. These guys have risistance to magic, and immunity to lightning. As I said above, Fireball, Flame Wave, and Wall of Flame should be the primary weapons against these guys. Rouges may or may not have a hard time, depending on how powerful their bow is.