Louis Schmidt is a foster kid who is 6 years old. He is a foster kid whom Alan and Walden foster in hopes of adopting.
Louis is a kid who gets along with both his adoptive families very well.
Louis seems to have mixed feelings for Walden, but must like him an extent because he was very excited to find out he was moving in. They got off on the wrong foot, but they became good friends and Walden became a great father.
Despite his flaws that everyone else sees, Louis thinks Alan is the "cool" parent.
Louis and Berta get along well, Berta shared her past experiences of being in the foster care system with Louis, and Louis admits to liking her and she is funny.
Louis's adoptive cousin. They've not met yet.
Lois's adoptive grandmother. She appears fond of him, but treats slightly bad as she did her children.
- Louis has had no on-screen meeting with Robin Schmidt.
- In Walden's imagination of 15 years later, Louis is attending college on the moon and communicates via a hologram on Walden's birthday.
- He's the new "half-man" of the show after Jake moved to Japan.