Lucian is Charlie's baby brother and has to go to the daycare center. He is often confused by his sister's gender and prefers to refer to her as a boy. He is ridiculed at his daycare for not having a father and mother (who takes care of them).

He has an impressive vocabulary and is not afraid to use it. He is pretty smart for his age but is still childish at times.

He can be voiced by a male or female. He should sound like a child with a matter-of-factly tone.