It is going to be rigged like it always does. Has Luffy ever fell off top 1, kinda fishy there? And wasn't Nami far behind in the ranking and then all of a sudden in a week she got an absurd amount of votes and climbed to number 3. I won't put too much stock in those ranking polls.
In other manga polls:
- Naruto made it 3 out of 7 total polls, lost it to Kakashi 2 times, lost it to Sasuke 2 times, was even No.4 behind Deidara in 6th poll.
- Gon has always been No.3 behind Killua and Kurapika in all three HxH polls.
- Ichigo made it on first three polls but dropped to No.3 in the last poll.
But One Piece polls seems fishy to me.