User blog comment:DancePowderer/Soundtrack Entrances/@comment-3125914-20121130073952

Luffy: Simple Plan-Me Against The World (more or less)

Zoro: Pillar-Frontline

Chopper: Lovers and Liars-Anthem For the Lonely

Robin: Nightiwsh-Nemo

Tashigi: Megan McCauley-Fragile

These seem to be everything I could think of.