In Mario Boos can become up to a whole room if you look at them to long and they don't breath. They are called balloon boos
you cant Yoshi cant kill ghosts
Ghosts of Luigi are just there for u to beat
Staff Ghosts Are The Time Trial Ghosts Left By The Game Testers Before The Game Was Released
there nothing
on the ghosts
You cannot really kill ghosts in Super Mario unless you have an invincibility star in use. However, you can stop them by looking at them, which makes them cover their faces.
look on your wii
unlock 8 fast staff ghosts or beat 100 ghosts (your choice)
You can't. Note the fact that when ground-pounded, Boo says "Ghosts... Don't... Die!"
to unlock any expert staff ghosts in Mario Kart Wii, you gotta beat the normal ghost in the time trials.
If you mean from Mario Bros, it's Boo.
Mario Torres does special effects, sculpting and other art work for movies such as Ghosts of Mars.