Yeah, on the Autobots side, I think the only ones who don't change at all are the three that PrymeStriker mentioned: Optimus (barring his Orion Pax episodes that simply reverted every change made to him in that three-parter), Bumblebee (him suddenly gaining a personality when he gets his voice back at the end doesn't count since he barely had a personality to begin with), and Bulkhead.WreckerJack wrote:I think a lot of the characters really changed over the series too. Like Ratchet going from not being able to stand humans but by the end he wants to stay on Earth a little longer. Smokescreen stops being so impulsive and learns to think more. Arcee learns to open up to her teammates despite her fear of loss.
And for Optimus it's a shame too, since the Orion Pax episodes were when he was at his most interesting in the whole series, showing more sides to himself and his personality than he ever did as Optimus Prime.