Tell me anything that is rather unusual for a pianist, but not strange ones like a pianist playing with his feet or upside down, but unusual skills like some can learn Chopin etudes 10/2 or 25/6 with almost no problem, can learn a Chopin Polonaise or Concerto within less than 4 months time(Usually 15-year old guys like me takes about 6 months to learn a single polonaise or a 50-page concerto)Has incredible memory, able to memorize a piece in an instant once it has no more mistakes and is already in top quality, or in 1 solo concert a pianist playing 2 giant-concertos like Rach's #3 or Tchaikovsky's #1.
For instance, Chopin's etude 25/6 is relatively easy for me to learn, but it's really tiring to play.