Star Wars: Knights of the Old Republic/T3-M4

T3-M4 joins your party after getting him from Droids by Janice in the Upper City North on Taris: while he must be a member of your party to open the security door to the Sith base to allow you to escape the planet, after entering the base you can exit immediately to remove him again.

Although he communicates in a series of beeps and boops, their meaning is made clear by your responses, or those of another party member. You can't unlock further dialog by speaking to him, but he may comment during dialog when in your party, although unlocking this may also be conditional on others being added or removed, among other things:

Dantooine

Location	Dialog	Add	Remove
Grove	Bolook		Bastila, Carth
Courtyard	Elise
Matale Grounds	Ahlan Matale
Matale Grounds	Matale Droid

Tatooine

Location	Dialog	Add	Remove
Anchorhead	Iziz	HK-47
Droid Shop	HK-47
Dune Sea	Tanis Venn
Eastern Dune Sea	Star Map		All

Manaan

Location	Dialog	Add	Remove
Hrakert Station	Mercenary	HK-47	Carth

Korriban

Location	Dialog	Add	Remove
Dreshdae	Lashowe		Jolee, Canderous, Carth
	Czerka Representative		HK-47
Sith Academy Entrance	Sith Academy Guard	HK-47
Sith Academy	Uthar Wynn	HK-47
Tomb of Marka Ragnos	Rogue Assassin Droid		HK-47
Tomb of Tulak Hord	Mekel	HK-47	Carth

Leviathan

Location	Dialog	Add	Remove
Prison Block	Shop Droid	T3-M4
	Decommissioned Droid	T3-M4
	Rodian Prisoner	T3-M4

Star Forge System

Location	Dialog	Add	Remove
Central Beach	Carth (romanced)