A nameless hiker and the case the internet can’t crack
Regarding his identity; I used to hang out on #coders on IRCNet from the mid 90's to the early 2000's. There was a guy there called MostlyHarmless and I think both the age and nationality checks out. I haven't been there for ages and I am pretty sure that the channel was password protected but it would probably take somebody just a few minutes to check around there amongst the regulars to see if they're the same guy. Right now there isn't a user online called MostlyHarmless, which there always was back then.