Somebody, don't recall who, said that none of them are _really_ nicknames untill the target accepts and responds to one / them, choosing their own nickname... True?
Little Jade Pumkinhead (used in web page - no longer called that)
Spike-y (due to hair at one point - no longer called that)
Tasha or Tasja (for those who don't want to say Nastasja)
The Smile Factory (a classic and very apt as it works both ways :-)
Thumper (due to early (pre-crawl/walk) leg action)