When determining your character’s ability scores, increase one score by 2 and a different one by 1, or increase three scores by 1.

Doppelgangers mature slightly faster than humans but share a similar lifespan—typically a century or less. While a doppelganger can transform to conceal their age, the effects of aging affect them similarly to humans.

Doppelgangers tend toward pragmatic neutrality, and few doppelgangers embrace good.

You are a Monstrosity.

Doppelgangers are about the same size and build as humans. Your size is Medium.

Your base walking speed is 30 feet.

You can see in dim light within 60 feet of you as if it were bright light and in darkness as if it were dim light. You discern colors in that darkness only as shades of gray.

You are immune to being charmed.

You gain proficiency with the two following skills: Deception, Insight.

As an action, you can change your appearance and your voice. You determine the specifics of the changes, including your coloration, hair length, and sex. You can also adjust your height and weight and can change your size between Medium and Small. You can make yourself appear as a member of another race, though none of your game statistics change. You can’t duplicate the appearance of an individual you’ve never seen, and you must adopt a form that has the same basic arrangement of limbs that you have. Your clothing and equipment aren’t changed by this trait.

You stay in the new form until you use an action to revert to your true form or until you die.

If you surprise a creature and hit it with a weapon or unarmed attack during the first round of combat, the target takes an extra 3d6 damage from the attack.

You have advantage on unarmed and weapon attack rolls against any creature you have surprised.

You can use your dexterity modifier to make unarmed strikes. When you hit with them, you deal 1d6 + your Dexterity modifier bludgeoning damage.

As an action you can magically read the surface thoughts of one creature within 60 feet of you. The effect can penetrate barriers, but 3 feet of wood or dirt, 2 feet of stone, 2 inches of metal, or a thin sheet of lead blocks it. While the target is in range, you can continue reading its thoughts, as long as your concentration isn't broken (as if concentrating on a spell). While reading the target's mind, you have advantage on Insight, Deception, Intimidation, and Persuasion checks against the target.

You can speak, read, and write Common and two other languages of your choice.