Not in any particular order:
The announcers at the Pod Race
Jar Jar
Sebulba
Anakin (1st)
Boba Fett (kid)....such a prick
The old Geonosian leader who talks like he's a pygmy from Africa (withclicks)
Grievous (his annoying cough and voice)
I still find it hilarious whoever said he hated that guy who said "if only Senator Amidala were here...."
I can't really say I hate the EWoks. My first American movie I watched as a Kid was Ewoks The Battle for Endor so I loved Wicket from the start. I actually got into Star Wars cuz I saw Wicket in a Return of the Jedi picture book. I was like "WTF is an Ewok doing in Star Wars???" 😛