I didn't know this was possible until today. You can search through POL for names of character, and it returns the account they are linked to.
Maybe this might help some people.
In POL go:
1) Upper right hand corner > Friend Search
2) Hit yellow Left arrow twice to set it to "Final Fantasy XI"
3) Type Character Name
4) Hit Search
5) Click on the names under "Search Results"
6) Click View Profile to see the account.
7) Click on the XI image tabs to browse the other characters on the account.
Pikko appears to be absent on Lakshmi, it doesn't list anyone holding the account. I'm unsure of how it works completely, so maybe you can hide characters.
Edited, Mar 22nd 2010 11:03am by Pud
Edited, Mar 22nd 2010 11:05am by Pud