Unlike his animated counterpart, his surname is displayed as "Hunnicutt" in the credits for The Really Loud House.
He has upstaged Lincoln since they were little kids, and Lincoln has always been thinking of ways to upstage him in return. One such instance involved Liam playing his fiddle in show-and-tell, which motivated Lincoln to try to learn how to play the piano.[1]
He is the second of Lincoln's friends to experience a one-sided romance with one of his sisters, after Clyde in the original series. In Liam's case, he became attracted to Luna in "All Is Fair in Love and Sleepovers".
Unlike Clyde's crush on Lori, Liam quickly gave up on his crush on Luna after hearing her mention that she is currently dating Sam.