The basic idea of what I'm looking for is the Manakete from Fire Emblem. Manaketes, for those who don't want to or can't read the link, is a race/class of humanoids that turn into dragons.
I am aware of Dragonkin from Starfinder and the Taninim race from Rite Publishing.
Theses are fine options but I'd like the ability to play a human who can turn into a dragon. The best option I have so far is to tweak the Taninim race and their corresponding class Dragonic Exemplar.
Any advice?
mebbe some sort of racial ability feat tree or level-scaling template (kinda like those unchained scaling items or the vigilante talents), involving the form of the dragon spells? ;)