Guest is a member in Sploder. The only thing that is special about this account is that it has been "online" for many years.
Conspiracies
There was also a rumor saying this user died while he was online, however it is very unlikely.
Many myths and speculation has been surrounding this member and his activity. No one really has no idea whether it is just a glitched account or perhaps something else.
Some people call it the creepypasta of Sploder.
Some other people say this account was made by an admin or mod and when all the guests are offline then the account goes offline but even if the account is offline, it won't ruin it's activity of 5 years.