Reds- are the primary ranged fighter throwing fireballs and are immune to fire. Are also very weak in melee. If you can try to position them to where enemies cannot reach them. (ie. in melvins kitchen, position browns between enemies, or just somewhere close to you to provide support.) you can get them to be very powerfull. Normally 5-10 Reds will be enough to light enemies on fire. but definatly support them with some kind of melee minion.