They would definitely be humanized, meaning their default would be human. Whether they could shift into dragon form or take on other shapes would require a review of the entire app and their entire power set. Our general goal is to allow rifters to remain unique and retain what makes them special, but not to allow them to completely outstrip canon characters in ability or power level, and shapeshifting into dragons in particular is an extremely rare ability in Thedas. So if a rifter character's only ability was to shapeshift into a dragon, we would approach that differently than if turning into a dragon was one of several abilities. Most likely there would be some limits imposed even if turning into a dragon was the only ability they possessed, since a dragon is inherently something that can turn the tide of an entire battle and would potentially make other player characters redundant in combat-focused plots—but again, we can't say for sure what we would allow without reviewing the actual application.