GT-R Megatron and Noa (2013)

Over the almost 40 years of the Transformers franchise, and the literally thousands of toys created over that span of time, and the dozens (if not hundreds) of different alternate modes those toys have taken, it perhaps goes without saying that the automobile remains the most common alternate mode in the franchise. That said, it remains comparatively uncommon for an automobile-mode Transformer to be a Decepticon, rather than an Autobot, and even less common for such a Decepticon to use an automobile alternate mode that is not only a real type of car (as opposed to something made up, usually to avoid having to pay for intellectual property rights), but a specific real world automobile! GT-R Megatron is indeed an example of this uncommon occurrence.

Let's first discuss some of the history that led to this toy. To do so, we need to look back at least as far as the Alternators line, which started in 2003, and its die-cast Japanese counterpart, Binaltech. These lines featured licensed vehicles that were created to 1:24-scale (a common scale for non-transforming model cars). The latter line had a spin-off called Binaltech Asterisk, which used some of the Binaltech molds alongside PVC figurines of human girls, which itself was replaced by Kiss Players, again using old Alternators molds (that is to say, the plastic version as opposed to the die cast versions) alongside PVC figures of young girls. This latter line deserves less discussion than I'm giving it, but it's relevant. For now, it's enough to say that these forays into PVC companions eventually gave way to a brief return of the Binaltech line, which was eventually replaced in 2009 by the Alternity line. Alternity, like Binaltech before it, featured die-cast parts and apparently licensed vehicle forms, but unlike Binaltech, Alternity was done at a smaller 1:32-scale and had no American counterpart. Alternity ended in 2012, but the Alternity Convoy (that is, Optimus Prime) mold became the basis for a new line in 2013: Transformers GT: Mission GT-R, which consisted of just four toys, all retools of Alternity Convoy, but decoed to represent real-world race cars in the Super GT series (said by Wikipedia to be "the top level of sports car racing in Japan"). While these four toys were mostly just redecos of each other, each did feature its own distinct head, a distinctive weapon, and a unique-mold human companion. 

Yeah, more young girls (I want to stop short of accusing these toys of promoting pedophilia, but the pattern really does make me squirm a bit). These "GT Sisters," as they're called in the Transformers GT fiction, are modeled after the race queens employed by real-world Japanese racing teams, even using the outfits worn by specific real-world race queens. The GT Sisters aren't "really" human, but rather are constructs created by each GT Transformer's own "matrix" (a clear reference to the Matrix of Leadership, but not quite identical to it... it's complicated). Despite being created artificially, each GT Sister is fully autonomous and has her own personality. GT-R Megatron's GT Sister is named "Noa." Unlike the PVC figurines that came with earlier lines, Noa is highly posable, and comes with several pairs of swappable hands that can be interchanged for a variety of uses.

While GT-R Megatron has his own unique head sculpt, it's not really one I readily identify with Megatron. Also, the fiction suggests that "Transformers GT" is a racing circuit that draws competitors from multiple timelines, making it difficult to ascertain exactly which Megatron this might be. The instructions (and an English-language paragraph on the front of the package) give a run-down of several contenders (including at least one not actually named Megatron in the first place!) and, although I've seen nothing to support the idea (the TFWiki just places him with the G1 Megatrons, for example), my best guess for a face match is Beast Wars Megatron, specially as he appeared in the Beast Machines era. Since the other three GT Transformers are more clearly G1 characters, the Wiki could easily be right and I'm wrong, but I'd invite anyone with better data to go ahead and say so in the comments.