^ Gosh all of those songs are so epic. I don't usually remember BGM music from anime very often but a few of those I can almost hum note for note.
Anywho my picks would be:
Opening Theme: "Brand New World" by D-51
http://www.youtube.com/watch?v=6besCjCWDqA
Ending Theme: "Asu ga Kuru Kara" by DBSK
http://www.youtube.com/watch?v=MLEMB_mRJG8
Movie Theme: "Sayaendou" by NEWS
http://www.youtube.com/watch?v=A1pDiyO7wyU
Then the character image songs I'm most fond of are:
"Wanted!" - Monkey D. Luffy
http://www.youtube.com/watch?v=9lR2FwmJOSc
"Spirit of Zoro" - Roronoa Zoro
http://www.youtube.com/watch?v=xiXbed8CMWo
"Between the Wind" - Nami
http://www.youtube.com/watch?v=xsRvWGwDbHo
"Usopp no Hanamichi" - Usopp
http://www.youtube.com/watch?v=Sq5nT9z7EP0
"Girls ni Kubittake" - Sanji
http://www.youtube.com/watch?v=Q4G8Pc0oU2M
"Twinkle Twinkle" - Tony Tony Chopper
http://www.youtube.com/watch?v=VrTpdyG5mZ4