I like this but True Strike is practically useless if not just a downright hindrance. The exception is if you have a Sealed Drakonsoul Augmenter. That entire ability was designed to make it actually useful.Here's what I was thinking. Clearly, if you have different imaginings of what each dragon type is like, their general "flavor," any and all of these choices can be redone/spells replaced.
Now for argument's sake, if the white dragon opened combat as an ambush it would be very effective to try and drop that cleric or other magic caster.
On another note, I love dragons. Because I love dragons, what about sapphire, fang, deep, and so many other dragons that 5e has left out. Honestly, I think having a psionic gem dragon being cursed with a human form would be very interesting.