Compassion

Compassion is the secondary protagonist of Inside Out 2: Joy's Son. He is voiced by Noah Schnapp, who recently voiced Charlie Brown in The Peanuts Movie.

Birth
He was given birth by Joy after Riley is getting used to San Fransisco, her new hometown. Even as a baby he always inherits his kind, helpful and sorrow personality.

8 year-old life
He spends most of that life helping in handling memory orbs, daydreams, and more machines in Headquarters. He always shows remorse when his mother or Sadness is sad, and does the best he can to cheer them up.

Accident and ending up in Riley's mind
One day, as he is gathering memory orbs, one of the orbs slipped from his hands forcing him to struggle as he can to get it, but too late, he ends up getting sucked into the mind along with the memories he is holding, much like how his mother and Sadness got sucked into Riley's mind in the original film.

Waiting for his rescue
As patient as he can be, he spends his time waiting by imagining that he is a future emotion. However, as the film progresses, he eventually becomes tired and takes his sleep on a cotton candy chunk in Imagination Land.

Rescue
Eventually, his resting time ends when he hears the loud footsteps of his rescuers. After being reunited with his mother, his uncles and his aunts, he apologizes to his mother for the accident earlier, though she forgives him and tells him that he has a patient heart and is able to pass the time awaiting rescue.