[Mister Ed]

All the Brain class means is that no monsters have bonuses specifically against the Brain class. It is actually quite lame unless you have the Super Munchkin card so you can add another class and avoid all the bonuses against that class as well. But even then, what you are avoiding is bonuses that are specifically targeted at that class. If you are a Brain, that does nothing to negate any bonuses targeted against anything BESIDES one of your classes. If a Monster has a bonus against your sex, for example, it still counts. Any bonuses that are general, and not having anything to do with your class, also still count.