You have dedicated yourself to learning the deep, intimate processes of the mind. You can more easily understand how people think & about how trauma can have long-lasting consequences in a person's behavior & health. Whether you use these skills to heal or manipulate others is for you to determine.
Skill Proficiencies: Insight & two of your choice from Deception, Intimidation, Medicine, or Persuasion
Languages: One of your choice
Equipment: A bottle of black ink, a quill, a small knife, the dossier of a former patient (not necissarily your own), a set of fine clothes, and a belt pouch containing 5 sp
As someone that has studied both typical & divergent behavior, you are intimately familiar with your own thought processes. This allows you to more easily detect when your mind & perception of reality is being manipulated by an outside force. If you fail a saving throw that causes you to have the Charmed or Frightened condition, you have advantage on your next turn when you can make the saving throw again to end the effect. If the effect does not allow you to make the saving throw again to end the effect, you can now attempt to do so as an action.
Use the tables for the sage background in the Player's Handbook as the basis for your traits and motivations, modifying the entries when appropriate to suit your identity as an alienist.
Your bond is likely centered around either a close collegue, your mentor, or a patient that you seek to cure. Your ideal is no doubt related to how you continue to seek a better understanding of the mind, either to treat those who suffer from mental illness or to manipulate others for your own ends.