This is reflected in his Persona's appearance, looking like a superhero-themed muscleman that channels its attacks through a weapon.
Yu, blocking off the first round of attacks, is then possessed, having an antenna over his head; forcing him to attack his friends, repeatedly switching through many of his Personas.
He's also by far the fastest person in the party.
Best shown if you hook up with Chie during her Social Link, causing her to become noticeably over the likes of Yukiko, Rise, or Naoto.
She also mildly deconstructs the trope, as she mentions that her ravenous appetite is one of the things she finds unfeminine about herself and is thusly ashamed of.