Been reading through Fizban’s which is an awesome book, but I think they missed a good opportunity to have a Dragon Warlock sub class so I made one.  Thoughts, tweaks, suggestions?

The Dragon

You choose your patron's type either Metallic, Chromatic or Gem

1st level The Dragon lets you choose from an expanded list of spells when you learn a warlock spell. The Dragon Expanded Spells table shows the drsgkn spells that are added to the warlock spell list for you, along with the spells associated in the table with your pa- tron's kind: metallic, chromatic, or gem.

At 1st level you begin to grow dragon scales the same as your patron.  When you aren’t wearing armor or wielding a shield, your AC equals 13 + your Dexterity modifier. This increases at 6th level to 15+ your Dexterity Modifier, and finally to 17 + Dexterity Modifier at 14th level

At 6th level you gain advantage on Charisma (intimidation) checks.

At 6th level choose a damage type from the table bellow associated with your dragon.  You gain Resistance to that damage type. In addition when you deal damage with a spell or an attack you deal an additional 1d6 damage of the chosen type.

At 10th Level you learn to channel some of your Patron’s legendary resilience. Whenever you finish. A short or long rest you gain temporary hit points equal to your warlock level + your Charisma modifier. In addition when you should fail a save you may choose to succeed instead, but once you use this feature, you can't use it again until you finish a short or long rest.

At 14th level you gain the ability to cast Draconic Transformation without expending a spell slot. Once you use this feature, you can't use it again until you finish a short or long rest.

Seeing the different spells based on the type of dragon reminds me of the genie warlock.