Morgan is a teen, 13 days away from becoming a young adult. She is a high school student with a C grade, and carries a homework book in her inventory. She has four skill points in mischief and has the Party Animal aspiration.
Morgan is part of the Renegades club along with Max Villareal, Ulrike Faust and Wolfgang Munch. Even though Morgan is part of the Renegades, she has the good and outgoing traits, implying she possibly acts to be mean and isn't mean at heart. It is also implied by her family biography that her sister can't stand Morgan's attitude, though she doesn't have any negative relationships with Siobhan in-game.
There appears to be some romantic attention between Morgan and Paolo Rocca in The Sims 4: Get Together announcement trailer, since she confidently approaches him at a party and is later shown kissing him. However, this did not translate to the final game since Morgan doesn't even know Paolo, and is too young to have a romantic relationship with him.