Because of having 2 souls and 2 minds within 1 body they have resilience to any attempts to charm and intimidate giving you advantage.

after a rest a d20 must be rolled if a 1 is rolled the character gets advantage on their rolls and changes alignment to that of the dragon (alignment of choice) and +3(+1 extra every 4th level) to their strength and dexterity but -3(-1 extra every 5th level) to their intellect and wisdom and will attempt to destroy or kill anything during that time that is not advantageous to their survival. if a 9-10 is rolled anything that would use the dragon's strength or dexterity has to be rolled as disadvantage as the dragon's soul within is stronger and trying to escape gives +1(+1 extra every 4th level) to strength and constitution but -1(-1 extra every 5th level) from intellect and wisdom. if a 11-19 is rolled then you gain +1(+1 extra every 4th level) to your int and wis stat but -1(-1 extra every 5th level) while when a 20 is rolled you gain +3(+1 extra every 4th level) to your int and wis stats but -3(-1 extra every 5th level)

Your Strength score increases by 2, and your Charisma score increases by 1.

cursed dragonborn's are taller and heavier than humans due to the dragon souls influence over the body, standing well over 6 feet tall and averaging almost 250 pounds. Your size is Medium.

You have draconic connections from your merge. Choose one type of dragon from the Draconic Ancestry table. Your breath weapon and damage resistance are determined by the dragon type, as shown in the table.

Draconic Ancestry

You can use your bonus action to summon destructive energy. Your draconic connection determines the size, shape, and damage type of the summoned element. A creature takes 2d6 damage on a hit using your bonus action. The damage increases to 3d6 at 6th level, 4d6 at 11th level, and 5d6 at 16th level. a creature takes 2d4 damage on a projectile hit using your action. the damage increases to 3d4 at 5th level, 4d4 at 10th level, and 5d4 at 15th level. After you use an elemental attack 6 times, you can’t use it again until you complete a short or long rest. 

You have resistance to the damage type associated with your draconic ancestry.

You can speak, read, and write Common and Draconic. Draconic is thought to be one of the oldest languages and is often used in the study of magic. The language sounds harsh to most other creatures and includes numerous hard consonants and sibilants.