The Dragon Student

Source: Children of the Dragon

The Dragon Student is an unusual patron, as you are the one teaching it. Your power comes from your dragon student, but it is you who helps it harness this awesome power. Technically this power comes from lo, the dragon primordial of creation, who gifted this power as an otherworldly patron. But it's your dragon student who grants it to you directly. This is why you are more warlock than wizard.

You are a Dragon Master, a young student of the Darastrix Academy. At a young age you were bonded with a dragon wyrmling, entrusted to you by its dragon parent.
Even though you are a student, you are a master in your own right to your dragon wyrmling, as you teach it to harness its power. Due to the bonding, your wyrmling shares your drive to learn its dragon magic quickly, at the cost of other aspects of its draconic might being weakened.
Although you are technically a wizard, the bond that you have made with your dragon has granted you access to its awesome dragon magic, but in exchange your own studies towards the arcane have been limited. Moreover, due to your bond you share some of the dragon's temperament, and you are inclined to actively seek out the joy of adventure. Now you and your dragon wyrmling bonded partner go out on adventures, as you seek to put the power of dragon magic into practice, regardless of your young age.
Most Dragon Masters are human, but half dragons have been known to teach siblings. Celestial, gem, and steel dragons don't send their young to become dragon students, due to their secretive nature and strict traditions.
Your magical bond with your dragon companion grants you access to its powerful dragon magic in addition to your own mortal magic. For example, a Bigby's hand would look like a fist when cast by a humanoid, and as a flaming claw when cast by its red dragon student. And even though you still need to study, most of your magical power comes from this bond. As such, Dragon Masters have a saying when it comes to their dragons: You teach me and I teach you.

Aerial Superiority

At 14th level, your dragon's flying speed is increased to 50 feet, and it doesn't provoke opportunity attacks when it flies out of an enemy's reach (nor does its rider).

While you are mounted on your dragon, you can force a direct attack targeted at you to target your dragon instead, as it shields you from ongoing attacks. Area effects still affect the both of you normally.