This might be the first (or the only) in a series to be called “Ideas and Opinions that No One Asked Me For.”
If you are a human being named Anthony and for whatever reason, possibly under the influence of precocious exposure to Mr Wilde’s masterpiece, you prefer to be called Algernon, well then, Algernon it is. If, however, you are a writer of novels and you want your main character to be called Algernon, for whatever reason, why on earth would you name him Anthony and then tell us that everyone calls him Algernon for no reason at all? I mean, he’s a fictional character, call him whatever you like but don’t try to insinuate that Algernon (“unabbreviated” or otherwise) is a normal nickname for Anthony.