Doppelganger

Alignment. Dopplegangers are Neutral creatures, as the problems of one form can easily be solved or ignored with another form.

Languages. Common and two languages of your choice.

Shapechanger: As a bonus action, you can change into any medium sized humanoid. This new form can only be discerened by those familiar with the new form. At 10th level, you can cast Polymorph at 4th level on yourself and can transform into any medium sized creature with a Challenge Rating equal to or less than your level. While in this form, you can still speak and cast spells. You can cast this spell once per long rest.

Manipulative Instincts: You have proficientcy in two of the following skills: Insight, Deception, Intimidation, Pursuasion. You can cast Detect Thoughts once per short or long rest. Charisma is your Spellcasting ability.

Mental Hardening: You are immune to being Charmed and Frightened