I have been lucky enough to have owned (ok, been a servant to) a pure black short hair Manx, a pure gray short hair and a pure white short hair at various times during my life..
Yes,I have one. His name's Shadow.
Yes as a kid. I have had three black cats but the one now has an orange spot of her lip. the rest of her is solid black.
Years ago, I shared life with a cat who's mother was pure bred Pierpoint Siamese and who's father was a fence climbing rogue. *L* She was a great cat with a wonderful personality and she was all black.
I had one named Lightning ages ago.