The following have seen script overhauls that include functions as well as interactions:

Items:
Bounty Puck

NPCs:
Worker
Boat Pilot
Capital Ship Pilot
Potential Mayor
Cleric

Droids:
G2
4S0S
2-1B
Chroon-Tan B-Machine
DD-13 Medical Assistant
FX-7
MD Medical Specialist
Republic Medical Droid

Creature:
Howlrunner

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As is tradition specifics are omitted on purpose, so if you want to know more please go out and explore these options. There are some very real functions hidden in these gems, explore and have fun!

Edit: Greeter script has been updated as well!