Dragonborn Ancestry (Blended)
Yours is the legacy of dragons: their blood flows in your veins, their scales cover your skin, their fire or ice burn within your soul. Proud, strong, quick to mature and driven to succeed, dragonborn excel in strength of arms and fierceness of will. Unlike some dragonborn, who show distinctively-colored scales like a known type of dragon, your ancestry blends the powers of them all, granting you vigor and intensity. You have the following ancestry features:
Ability scores: Increase your Strength, Charisma, and Constitution scores by 1. Or, you may choose to increase any one of these by 2, and increase another by 1.
Draconic Resilience: When you roll a Hit Die to regain hit points, increase the hit points restored by each die by your Constitution modifier (minimum 1).
Draconic Presence: Choose one of Persuasion or Intimidate. You gain Proficiency with this skill.
Dragon Breath: [As the existing dragonborn feature of 5e, I don't feel like writing it out]
Draconic Resistance: You gain resistance to the damage type chosen for your Dragon Breath.
In addition to your Ancestry features, choose one Culture approved by your dungeon master, or create a new one with your DM's approval. Many characters with dragonborn ancestry, or raised by parents of dragonborn ancestry, may have the following Culture:
Heir of the Empire ("Arkhosian")
Long ago, there was a great and shining empire of virtuous souls led by noble men and women--or, at least, that is what you were taught by those who raised you. That empire was a place of justice and achievement, a shining beacon to the world, but it was laid low by continuous wars against its enemies. It was not conquered, you were taught, but collapsed from within, its people scattered to the winds. Though they have not risen to the same height in the centuries since, they have never forgotten its legacy, and as an inheritor of that legacy, you carry on the pride and burden of its memory.
Proud History: All heirs of the empire are taught to value their history. You gain proficiency with the History skill.
Clan Bond: You are a bonded member of a clan that upholds the ancient traditions of the empire. Anywhere this clan has members, you can appeal to them for aid, but likewise, they may call on you for aid as well, and failure to aid your clan carries serious costs.
Self-Reliance: Each heir of the empire is expected to pursue their own greatness, gaining prestige for the clan and proving the spirit of the empire lives on. When you reject freely-offered aid as unnecessary, or turn down a physical reward, you gain one use of Inspiration, or two uses if you can convince that person to speak highly to others of you and your clan as a reward instead.
Additionally, determine the name of the empire that your Culture is heir to. In the world of the Nentir Vale, dragonborn descend from the fallen empire of Arkhosia, which once ruled lands far to the south, allegedly with justice and mercy, until war destroyed both it and its bitter enemy, Bael-Turath. Other settings may have had other empires--which may or may not have been specifically led by dragonborn, but which are nonetheless remembered and honored by their inheritors, regardless of their ancestry.