G1 Grimlockさんのイラストまとめ

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The Driller's working name was Colossus, The old name still pops up in media coverage.

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According to some concept art, he was supposed to transform from what looks like an electronic plush penguin to a penguin/condor/dragon-hybrid robot with VTOL wings. The robot mode is both ridiculous and freaky.

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For example, IDW's film adaptation shows 13 Primes instead of 7. In a later comic, only 7 are shown.

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Though barely glimpsed in the film, Josh Nizzi designed somewhat unique bodies and heads for each of the 12 during the film's pre-production. Interestingly, all of them appear to have energy glowing within their armor just as The Fallen does.

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Trench shares the same body-type as Scrapper and, by extension, Scrapmetal.

"Trench" was also an unused alternate name for the Beast Machines character Dillo.

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The M1 Abrams Decepticons featured in Dark of the Moon reuse the CGI model of Brawl from the first live-action movie, but given that Brawl died in that film.

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Scowl is a Dinobot gone bad. In a better world, Scowl could have put his prodigious strength, powerful hammer, and his Ankylosaurus mode towards constructive ends.

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Polarclaw uses a heavily altered version of Steeljaw's character model.

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Concept art for an unused character in Robots In Disguise. Originally slated to fill the role of Grimlock, he would have transformed into a Stegosaurus.

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Early concept for Underbite was the first Decepticon villain we met in the series. And it’s interesting to see what animal he is based on and how he came to be.