Two-soul Sorcerer

Upon your birth only one body was born but within the body hold two minds. Only one can control the body but the other one will try to take hold, they can cause your body to twitch, mess up your speech, or can try to lead you the wrong way.

Other Eyes

At 6th lv the the other being lends you their eyes that gives you the ability to see in the dark and increases perception and bonus on perception checks

Separated

14th lv : For half your HP and Spell slots, you spawn your other mind that takes the health and spell slots and can live freely but can't venture off 60ft

18th lv : does not cost HP or Spell slots.

Two better than one

At 18th lv. You ask the being inside you to aid you in battle or if it could help with diplomatic issues it will be an extra set of eyes and/or ears. Depending on how the being likes you it will enhance your spells, help you focus, or it can help with diplomacy

Loose-Control

Upon 1st lv. The character and the other being is constantly fighting for full control of the body. One holds control most of the time but at some points the other mind can take over and cause some unplanned movements or some strange thoughts. This leads to the player to have impulses or outbreaks -Ex: the player chooses to not drink ale, but the other mind wants the to drink and takes over to obtain some ale- that are out of their control.