Edited the title. Anyways in regards powers, GM or co-GM decides them (than players). In planar traits wise; you have planar traits of Hades inside the castle overall, however personal spaced areas match whatever is most favorable to you. However you cannot apply any exotic planar traits like magic imbuing, time accelerations etc. So any planar traits are more related to home planes and such. If your being from fire plane example, then your castle section has fire plane traits.