Well, the body and armor for the Tengu technically already exists - the Charr. If you look at the NPC Tengu models and compare their posture and especially their torsos and legs to that of the skinniest Charr body, it is close enough that simply reskinning the thinner Charr bodies to make the initial Tengu player models. They would need to replace the head of course, and swap the tails with featherdusters, but it CAN be done. As a 3D modeler, I've already taken a good, hard look at the reskinning idea. It is more plausible than you think. There is also the rumor that Tengu WERE planned for the initial base game release but were cut out at the last minute. This is news from 2012 when the game was still in beta and you could only play as humans and Norn, of course; but the theoried reason as to why the Tengu were excluded, along with the Canthan district of Divinity's Reach (of which there did exist real footage of) was because ... well, it was a politics in videogames issue involving China. I know no one wants to hear that, but according to the news at that time, they did not want GW2 using their cultural aesthetic. Now that the game has been released IN China for a few years, that is no longer an issue. I could be wrong, but this was buzz that I DO remember from 2012, way back when the area we all know now as the "Queen's Gauntlet Arena" / Festival center in Divinity's Reach was just a massive crater in the ground with NPCs talking about how a sinkhole swallowed the entire Canthan disctirct. You can still find screenshots of it to this day.