Your Dexterity score increases by 2 and your Charisma score increases by 1.

Emperor Tamarins become adults at about a year and a half and live to be 10 to 20 years old.

Most Emperor Tamarins are chaotic, given their animalistic instincts, but they are not typically unkind

Emperor Tamarins stand 1 foot to 2.5 feet tall and average about 2 pounds. They have tails longer than the rest of their body. Your size is Small.

Your base walking speed is 25 feet. Your climbing speed is always equal to your walking speed.

Your tail is dexterous enough to use basic tools, pick up objects, and hold you hanging from something.

You have proficiency with simple, light melee and ranged weapons. You have disadvantage on attack rolls with weapons that aren't light. 

You have advantage on rolls for foraging for food.

Whenever you make a Wisdom (Animal Handling) check related to primates or tamed animal species, you are considered proficient in the Animal Handling skill and add double your proficiency bonus to the check, instead of your normal proficiency bonus.

You have advantage on stealth rolls when you're at a higher elevation than the person/people trying to detect you.

You can speak, read, and write Common, and you can speak primate. Primate does not have a written language.