Answer:
What is yours but only used by others?
Possibly the only famous plumber who has the courage to ever to rescue a princess.
Material for making balls and men that only shows up at certain times of the year.
Written on with words of white, Has the color of the night, Is the teacher's best delight, And a student's daily fright
They're big and blue, and larger than seas
What sphinxes employ and players enjoy.