Dragon is the personification of the Interludes.
No, I’m kidding, but look: We first heard of her in Interlude 5, we met her in Interlude 6 and now she was in Interlude 7 too.
Anyway, here’s what I know: Dragon is a high-profile Tinker, considered the best by Bakuda, though her specialty is unknown so far. Security measures, maybe? She’s the creator and overseer of the Birdcage, but she also seems to have other high-standing roles in the Protectorate judging by Interlude 7. She’s also been known to make Tinkertech armor, damaged examples of which have been stolen by the Dragonslayers and used for villainous purposes.
She also might only exist in video form. :p