^90%* agree.The G1 universe is chock full of so many characters that writers can tap into and use. I really appreciate writers who take advantage of this. It not only shows a greater awareness of the G1 universe, but also feels far more satisfying for me as a G1 fan seeing G1 characters who've been previously underused (or not used at all) finally getting media appearances. Ironfist, Rotorstorm, Pyro --- Hasbro Overlord!! Phwoar! And of course, finally giving Thundercracker the characterisation he deserved (as per his original tech specs bio from 1984!). Each time I see these things appear in the comics, it makes me think, "I see what you did there."
They're all G1 Transformers. Carnivac's toy was never released in Australia, but he did appear in the G1 comics. Cancer is a Japanese G1 character, although his toy is identical to Squeezeplay.
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*My 10% disagreement comes from my personal dislike of non-toy characters making prominent appearances in canon. I'd rather writers just work with existing toy characters as much as possible.