Green Dragonborn (Updated)

Breath Weapon: When you take the Attack action on your turn, you can replace one of your attacks with an exhalation of magical energy in a 30-foot line that is 5 feet wide. Each creature in that area must make a Dexterity saving throw (DC = 8 + your Constitution modifier + your proficiency bonus). On a failed save, the creature takes 1d10 Poison damage. On a successful save, it takes half as much damage. This damage increases by 1d10 when you reach 5th level (2d10), 11th level (3d10), and 17th level (4d10).
You can use your Breath Weapon a number of times equal to your proficiency bonus, and you regain all expended uses when you finish a long rest.

Damage Resistance: You have resistance to poison damage.

Innate Spell Casting: You know the cantrips Friends, and Gust. When you reach 3rd level, you can cast the Jump spell once with this trait and regain the ability to do so when you finish a long rest. When you reach 5th level, you can cast the Suggestion spell once with this trait and regain the ability to do so when you finish a long rest. Charisma is your spellcasting ability for these spells.

Swift Swimmer: You have a swim speed of 35ft, and can hold your breath for a number of minutes equal to 1 + your Constitution modifier x 2. Additionally, you have advantage on athletics checks focused on swimming.

Languages. Common, Draconic