D&D 5E DRAGON PLAYER CHARACTER MANUAL
D&D 5E DRAGON PLAYER CHARACTER PC

Since True Polymorph isn't a spell of 8th level or lower, characters shouldn't expect that their wish be successful. Wishing at lower levelsДЄ lower level character might discover a ring-of-game-breaking-wishing (or its equivalent) and make this wish. Since permanently being an adult dragon via True Polymorph isn't expected to break the game, being an adult dragon (which can't be dispelled) shouldn't break the game either. For flavor he should probably turn into the same type of dragon as the dragon in his draconic heritage for his bloodline.

D&D 5E DRAGON PLAYER CHARACTER MANUAL

Any of the adult dragons in the monster manual should be appropriate permanent forms for the sorcerer. True Polymorph allows a creature to be turned into any other creature with the same or less challenge rating.

Since you subjected the sorcerer to great additional risk to use Wish to become a dragon (and the sorcerer really wished to be a dragon) you should treat this as a change in reality rather than a magical effect that can be dispelled. I would treat this as if the sorcerer had cast True Polymorph (another 9th level spell) and concentrated for the entire duration to make the transformation permanent. I gave him exhaustion and said he needed time to recover from the ordeal, but I really need time to figure out what to do with him. So I set up a roll table: 00-10 killed him or similar, 11-35 turned him into an egg or against the party or a few other creative things, 36-50 the spell just failed with all of the negative effects of the wish spell gone wrong, 51-80 gave some cosmetic changes, 81-97 adjusted stats a little (can no longer hold weapons an shields but breath weapon is stronger etc.), 98-99 and it actually worked.

D&D 5E DRAGON PLAYER CHARACTER PC

I warned him about the chance of it going horribly wrong, but he said it would be out of character for his PC to turn down any opportunity no matter the risk. I was considering going with the 'the spell failed' option, but decided to have a little fun with it.

This spell might simply fail, the effect you desire might only be partly achieved, or you might suffer some unforeseen consequence as a result of how you worded the wish. The DM has great latitude in ruling what occurs in such an instance the greater the wish, the greater the likelihood that something goes wrong. State your wish to the DM as precisely as possible. You might be able to achieve something beyond the scope of the above examples. I'm running a DnD 5e campaign and had a dragon-born sorcerer with Draconic Bloodline as a sorcerous origin that used the level 9 Wish spell to wish to become a 'true dragon.'ДЄre there any rules about having dragons as PCs? If so, where? If not, how would you go about making it somewhat balanced? Background

D&d 5e dragon player character