An affable but gullible idiot, Neddie is often chronically poor and/or part of the Government (such as "The Strolling Prime Minister of No Fixed Address" or some other civil service title).
Sharing his actor's Welsh heritage, Neddie's appearance was also based on Secombe's own likeness, exaggerated for comic effect - often described as very short, round and immensely fat.
He also suffers from duck's disease (short legs), and shares Secombe's tenor voice, as used to identify him in "The Mystery of the Fake Neddie Seagoons".
Alongside announcer Wallace Greenslade, Neddie often greeted the audience at the beginning of the show, referring to them as "folks" or "Dear Listeners".
Seagoon also occasionally spouts patriotical nonsense, at which Grytpype says, "You silly twisted boy, you" or, on at least one occasion, "You twit."