Secret Agent XXX13 is an agent with the Australian Intelligence Service.
We use the operative's codename here because as of yet we have no idea what his given name actually is. Obviously he has one but for security reasons, they are not telling us hence our having no clue. I did notice that he is referred to in one narrative solely as 'XXX' which we might take as a nickname codename.
When we first meet him he is heading quickly but also, apparently suavely (is that a word) to meet his boss at HQ, his images showing he is a very snappy dresser in what appears to be a bespoke double-breasted suit and a dashing light-colored fedora. XXX13 is a moderately tall, very slender man with either extremely close-cut hair or nigh-on to being bald.
He comes across in that initial encounter as a cool, easy-going fellow, asking his boss, "What's on yer mind!" We do not any enough of that meeting to learn how his Chief responds to XXX13's cavalier-ness.
In later adventures we get a ever-so brief glimpse into his skillset when we observe him in disguise (is he a master at such things) tailing a dangerous suspect. He is also quite intrepid, as we are told this is taking place just after he had manage to "escape from a dastardly plot to do him to death". In yet another escapade (literally and figuratively) he has just gotten free from captivity aboard his enemy's yacht - even going so far as to sink the vessel hoping to put an end to his foes right there.
As to the foes he faces, we know for sure of only one but he is a repeat customer by the name of Count Nyne - a German-speaking nogoodnik who not only plagues XXX13 more than once, he has thrown at our operative "the gorgeous but snaky spy known as Cursya".