In earlier days, whenever Moose talked he would start off with a "D-uh", decades before it became a colloquialism indicating something so obvious that everybody should know it.

Laslo's difficulty in speaking English leads him to give his name as "Mason" to the immigration officials who let him into the country.

In earlier stories, there was a similar character called Lunk who had a reddish crew cut and a slightly leaner build.

In some stories one of the gang, usually Archie, asks for Moose's help with a problem that can only be solved by means of the big guy's strength or intimidating presence.

In "Guardian Devil," Archie and Betty meet a runaway child whose hospitalized mother left the boy in her brother's care, but the uncle locked the boy in his room and had wild parties in the house—until Archie brought Moose over to straighten things out; after manhandling the uncle, the intimidating Moose sends the partygoers running with the simple exclamation "Scat!".

[2] In another story, Archie had tracked down two thugs who robbed the Chok'lit Shoppe, using a description given by Jughead, whom the cops had found in the store and initially accused.

In one story, two young children vandalize a classroom in Riverdale High School but Moose takes the blame for them.

Moose is friends with Archie Andrews who is his teammate in sports and very loyal to him, Jughead Jones, Dilton Doiley and Betty Cooper.

At Ellis Island, afraid of being turned away because of his long name, he gives it as Lazlo Mannson, after a passing ice cream wagon.

[5] Moose is extremely possessive of Midge Klump, his steady girlfriend, and has time and again flattened anybody (Reggie Mantle is his most frequent victim) who seeks her affection.

At one point, Archie outright asks permission to date Midge, and Moose declined the request, but it showed, that at least Archie has the courtesy to ask him, whereas Reggie will stoop to dating her on the sly-which often results in Moose pounding up Reggie-as a running gag.

Archie was once able to use Moose's devotion and genuine concern for Midge to help him defeat a gang of robbers who were stealing office electronics from the school.

Rather than being angry over the deception, Moose showed relief that Midge was not in any danger and joked that stopping the crooks was more exciting than playing handball was.

Moose has a mean streak in many comics, and spends a lot of time hiding behind park benches inhabited by his girlfriend, Midge.

Moose's learning difficulties were later revealed to be dyslexia, which made it harder for him to understand what his teachers, such as Miss Grundy, were writing on the chalkboard.

A theme used in many stories is based on the Riverdale High rules that failing students are not allowed to participate in extracurricular activities.

The more modern version of him sports a shaggier hairstyle In Afterlife with Archie, Moose attends the Halloween school dance when the zombie apocalypse starts.

In private, Midge confides in Moose that she got a cut on her hand during the confusion at the school dance, although she doesn't know from whom.

Moose shows up in Robot Chicken in an Archie spoof of Final Destination, where he fails to save Miss Grundy from a falling car and is tried for and put to death for her alleged murder.