Whatever.I would let a player do this if they really wanted to. Half-dragon creatures are always more formidable than others of their kind that do not have dragon blood, and their appearance betrays their nature-scales. So half-dragon is a dragonborn with better sight?I think it's so you can have half-dragon dire wolves and half-dragon ogres and other shenanigans. Why would they have both this and dragonborn? It seems highly redundant. Dragon-like: From startingIf you're happy being simply dragon-like not an actual dragon, there are several options: DragonbornDragonborn (phb p 32) 'look very much like dragons standing in humanoid form, though they lack wings or a tail', have a breath weapon attack that they can use, and resistance to an element depending on what type of Dragonborn they are.If you have Xanathars Guide to Everything, there are some Dragonborn-only Feats that make them more draconic, e.g. If you're high leve enough to be able to become an Adult dragon this is normally a poor plan given you can throw around Wish/Miracle/etc and dragons don't (normally) have spellcasting.

If someone else is casting it on you and you're a lower level, Wyrmlings are CR 3-4 Young are 6-9, Adult are 13-17.Note that this will remove your class and racial features.

Full Dragon: Not until very high level/with high level friends probably a poor planIf your character has access to someone who can cast True Polymorph, the caster can transform your character into a dragon with a CR equal to or less than your level.If you're casting it yourself as a 17th level Wizard or Bard, that means you have all the Adult Dragons avaliable.

Half dragon d&d