An interesting thing about
key signatures is that at the end of the
circle of fifths--the
sharp keys--and the
circle of fourths--the
flat keys--the
Ends Battle and
Charles' Father in
Grimace's write up, the sharps and flats are
white notes.
This is to be expected, though most piano students do not. It is simple arithmetic: there are seven different notes in the octave, each of which can be sharped or flatted, but only five black ones, hence E# and B# are played as F and C respectively, and Cb and Fb are played as B and E respectively.
Regardless of the colour, all notes shoud be treated the same, though most piano students, including myself, even now, cannot yet do it perfectly.