Make profiles with info that's going to be relevant in the RPG and no more; I'll put the example of appearance. Don't put exact height in the profiles for your chars, for example, unless you really, REALLY feel as though you have to; remember, most races in Bionicle have all their races as the same height, anyways. Put enough info in appearance to describe a char as well as you'd like to see a decent artist would draw/paint/whatever preferred method they use, or more info if you really want to. It helps people to have a decent picture of your char mentally during RPing, especially when two chars are meeting each other. No one needs to know that the color of your char's tongue is purple, or something, unless if the said tongue is a SUPERTONGUE or otherwise relevant to RPing.
-Der Blitz