I agree with Gok about most of what he said in the character 'development'.
Cheetor was excellently done and his character progression believable from Beast Wars to Beast machines. As a result he is my favorite BM character.
Silverbolt was so emo that he may as well have dressed in black and tattooed tears under his eyes. The Silverbolt I knew would have felt depressed and guilty but would have endevoured to get over it for the sake of his comrades. This Silverbolt never really could and the end doesn't count because he didn't progress out of the depression but Primal actually wiped the cause of it indirectly by defeating Megatron.
Rattrap and Rhinox was what pissed me off the most and Gok covered it fairly well.
Optimus Primal becoming a new age hippy/ Religious extremist, I did not see that as logical. He basically became a religious extremist oposite on the opposite side of another, Megatron. It was very difficult to sympathize with his cause just as it would be difficult to sympathize between Muslim extremists and the Ku klux Klan. His was not a logical progression since Primal would not have carried on religiously like that. He was proud of his Cybertronian (hence Technological) heritage and would have tried to over throw Megatron to restore thing how they were original, not to push the superiority of Organic/Technorganic.
Megatron was covered by Gok fairly well. BW Megatron's aspirations were very much the same as G1 Megatron's. He wanted to rule the Predacons and conquer Cybertron. He didn't want to 'become cybertron' or change it in any radical way, he just wanted to rule it and have the Maximals in oppression just as he believed the Maximals were oppressing the Predacon population. As Gok mentioned, he felt pride of his progressing Beast modes because they granted him the power that he needed to accomplish his then goals. Beast Machines rewrote his whole agenda as if this Megatron had come from a parallel universe or was some sort of impostor.
BW Megatron aspired to accomplish what G1 Megatron couldn't and that is not the same character we see in BM.
With Blackarachnia I agree when it comes to logical progression but she lost much of her charm in the process.
Waspinator, no comment. Gok covered it.
I have to add the following. Beast Machines had G1 tributes throughout the show but they were terribly handled and felt forced. Many concepts such as The Oracle which was a radically different thing in concept than what we saw in G1 and the Optimus statues that we saw around had no real point in the overall story (Why was the statue holding the Golden Disc?? Didn't the people writing this show watch Beast Wars?!?). The tributes did not become important and logical within the story as in Beast Wars. They had to change the essence of G1 concepts that was taking in an important part of the story making them radically different things or the tribute was just a tiny pointless scene such as Primal talking to the Prime statue.
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Yamaha Dt-2