Top 5 Original Trilogy:

1. Emperor Palpatine
2. Grand Moff Tarkin
3. Darth Vader w/ Removable Helmet (RotJ)
4. Princess Leia: Bespin Gown
5. C-3PO

Top 5 Prequel Trilogy:

1. Jar Jar Binks (TPM)
2. Darth Tyranus
3. Jango Fett
4. Mace Windu
5. Anakin Skywalker (RotS)