Mine is 4.
It sounds stable and dark. It is also the smallest "Not-small" number. Gives me emotional power four some reason (HA! that pun tho).
Adding on, Kurusu Keigo, 4th diary owner in Mirai Nikki is so bad-ass.
Juror 4 in 12 Angry Men, fav juror in play.
First Schubert Impromptu I played: op 90 no 4
Beethoven's 4th piano concerto, my personal favorite concerto all time.