I always think that T3 is like R2, but T3 is way less cool than R2. I mean, R2 is smart, loyal, resourceful, motivated, and even a bit evil when necessary. But for T3, well sure he is loyal, and good at fixing things, but orther than a few plot twists(toor opening, ship repair opening, door opening quest, droid runaway) he is quite unimportant in the grand scheme of things, and relativerly quiet too compair to R2.
I wish they give T3 a bit more personality. I mean, we know about HK quite a bit, since ie is quite talkative, even as he sneaks up into ship trying to kill (sexy) Arkanians. What do we know about T3?