Tried to be original here, wich I ended probably not be :
Stand Name : Ego Stand Master : Maxime Guedj (random name I found online)
Description : A humanoid stand that ressembles his user and can read the thoughts and mind of anyone. If Maxime makes his target smile or frown, Ego can freely possess this person for as long as he wishes, leaving the user's first body defenseless (If the target is a stand user, Maxime does not obtain their ability, but can still use his Ego). Ego is sentient, as it is a representation of Maxime's lazy and capricious side. It can freely interact with its user and disobey him if it is displeased. For an unknown reason, it is obsessed with bananas.
Ta-daaa~