This is Ayane, my Mean Kitty. She has a split personality. She is ok with me, though she doesn't care to be held. If anyone other than myself enters the bedroom, she immediately starts growling. She growls and hisses up a storm. If my 11 year old brother comes in the room she is louder than normal. She has even gone so far as to come out from under the bed and attack my brother. She has lunged for him several times, grabbing onto his ankles. 

She can only be pet and paid attention to, short of holding, when she is in her "happy place". She is always nicer and calmer when she is in a regular bathroom. Her behavior has led her 20 lb brother to also chase after my brother. His name is Amano. He has a tendency to be a mean kitty, but not compared to Ayane.