Answer:
I am a celebrity fish.
I stand in one place yet fill the whole room. I can be filled with molten rock and come in every hue. What am I?
If lightning strikes an orchestra, who is most likely to get hit?
I am enjoyed by some, despised by others. Some take me for granted, some treasure me like a gift. I last forever, unless you break me first. What am I?
What can fill a room but takes up no space?
No matter how little or how much you use me, you change me every month.