The Dragon's Path

Be a Dragon Monk. This class was made for those who wish to play as a dragonborn and want their species to feel more impactful. Leave you Draconic Ancestry unselected in the character builder to avoid multiple breath weapons once you take this subclass. This subclass is for lightning dragonborn only as it was made for a specific character I'm playing. (Warning, not yet play tested).

Level 3: Dragon Breath

When you use your Dragon breath, each creature in a line in front of you must make a dex saving throw. The DC for this saving throw equals 8 + your Wisdom modifier + your proficiency bonus. A creature takes 2d6 lightning damage on a failed save, and half as much damage on a successful one. The damage increases to 3d6 at 6th level, 4d6 at 11th level, and 5d6 at 16th level and the ranges increase as well. You may use your breath weapon = to your wisdom modifier, recharges on short or long rest. This Also grants resistance to lightning damage.

Level 6: Call Lightning

 You can cast call lightning once per short rest.

Level 6: Dragon Scale Hardening

You can cast mage armor once per long rest.

Level 11: Fly

When you take a Bonus Action other than Step of the Wind, you can use Step of the Wind immediately after. (Fly speed must be added manually). 

Level 17: Chain lightning

You may cast chain lightning your wisdom modifier times per long rest.