According to "Everybody Loves Leni" initially Liam and Clyde didn't get along Lincoln's other friends, Rusty and Zach. Lincoln invited them all for a meeting, so they could get to know each other better. This helped them all to become friends.
His first appearance was in "Overnight Success", as one of the kids Lincoln invited to his sleepover, after Lincoln had a falling out with Clyde. Since then, he has made other appearances in other episodes.
Liam is a hard-working and dutiful at his family farm. He speaks with countryside accent and during "Back Out There" where he mentions doing stereotypical agricultural activities such as milking cows and that donkey poo was hard to get out. He gets along with his farm animals.
He also doesn't seem to be able to understand certain metaphorical phrases, such as Rodney complimenting them on their appearance and telling them they'd need to fight the ladies off with a stick, causing him to sadly remark that he had forgotten his stick.
He likes mud wrestling, basketball, chess and rock music.
Liam is as tall as Lincoln and has freckles on his cheeks appeared and disappeared. He has orange hair styled into a bowl cut, and two buck teeth. His regular clothing attire consists of a light and dark green striped t-shirt, brown shorts, white sneakers with green stripes, and white socks with red and blue stripes.
He speaks in a Southern accent.
In the Croatian dub in the first two seasons, he used to have a Shtokavian accent until Season 3, when he was given a Kajkavian accent which suits him better due to him living on a farm.
He was the last of Lincoln's closest friend group to have their last name revealed.
Despite getting a girlfriend in "Lincoln Loud: Girl Guru", in "Dance, Dance Resolution", he is dateless. It means that his girlfriend broke up with him prior to "Dance, Dance Resolution", the series' continuity is not consistent, or the episodes were aired out of production order.
How his buck teeth are lined up can vary. Sometimes they are lined up right next to each other; sometimes a gap is between them.
He has a younger sister who is in kindergarten and a brother.
So far, Liam, Ronnie Anne and Rusty are Lincoln's only schoolmates with known siblings.
He claims that a kid from the school who was forgotten and lives behind his barn, though it is unknown if this is true or if he made it up.
↑Hunnicutt, Liam (February 24, 2017). "Making the Grade" (in English). The Loud House. Season 2. Episode 5a. "My little sissy's in that there kindergarten class."
↑Hunnicutt, Liam (November 5, 2021). "Farm to Unstable" (in English). The Loud House. Season 5. Episode 22b. "Mee-Maw sprained her ankle, mud-wrestling Virginia, and my dad and my brother, they're at an egg convention."
↑Hunnicutt, Liam (May 16, 2017). "Out of the Picture" (in English). The Loud House. Season 2. Episode 14a. "I guess you're gonna end up like Marty Malach. ... He lives behind my barn."
↑This image from "Out of the Picture" (in English). The Loud House. Season 2. Episode 14a. May 16, 2017.
↑Hunnicutt, Liam (March 7, 2019). "Antiqued Off" (in English). The Loud House. Season 3. Episode 25b. "To me, it's [magic's] more upsetting than boring. I know there ain't no coins in my ears but they always find 'em."
↑McBride, Clyde; Hunnicutt, Liam (September 18, 2020). "Family Bonding" (in English). The Loud House. Season 5. Episode 3b. "Clyde: 'Something stinks here.' / Liam: 'Sorry, fellers. Meemaw's homemade yogurt.'"
↑Announcer (January 22, 2021). "Cow Pie Kid" (in English). The Loud House. Season 5. Episode 7a. "Now pitching for the Kangaroos is rookie Liam Hunnicutt."
↑"Cow Pie Kid" (in English). The Loud House. Season 5. Episode 7a. January 22, 2021.