The System Host is the absolute power and God of the S.Y.S.T.E.M., the power he wields is enough to kill or save humanity.
The Admins are the protectors, carrying out the wishes of the Server Host in a timely and acceptable manner. They are the people who enforce and protect rights. There are only three Admins at any given time. The maximum for Admins though, is considered to be five.
Moderators are the people who shape the S.Y.S.T.E.M., making technology and powers rise when the Admins want them to. They are in charge of creating dimensions that will benefit more than one group of people. Mods are also the people who are in charge of programmed life.
Legends are very powerful Users that can manipulate the S.Y.S.T.E.M. to a large extent and even make things go their way if able to. There have only been a handful of legends, you may have heard of some from stories. To name a couple of examples, King Arthur, Dracula, Grim Reaper, Cheshire, Muhammad, Jack Frost, and Santa Clause were/are all Legends.
Masters are powerful Users that can manipulate the S.Y.S.T.E.M. with plenty of skill, but they are not capable of surpassing a Legend. There are much more Masters than Legends, but it is still a ranking that takes alot of time and knowledge to perfect.
Elites are Users that have learned how to manipulate the S.Y.S.T.E.M. to an extent where they can most definitely pose a threat to any program that would choose to fight them. They call this rank the initiation of being a User, because until you become an Elite you are about as useful as a regular human.
Novices are newly found Users that have barely figured out how to manipulate the S.Y.S.T.E.M. These people are the ones that can only light candles with the amount of fire they produce from their finger tips, if they even know how to make fire from their finger tips.
Seekers are the coming of a User, they have the potential to become a person with limitless power, but they do not have any manipulation skills. So basically a normal person that has the capability of being a User now.
Hollows are programs that can see the S.Y.S.T.E.M. but can never be able to manipulate the S.Y.S.T.E.M. These people are usually depressed or insane people, due to them seeing things that normal people can not. Alot of them are home to insane asylums.
Programs are normal citizens, people who are unaware of the S.Y.S.T.E.M. or the actions you can do in them. So just like you and me, and everyone else living in this reality. Just normal people that have no idea what is happening around them. They don't know that random freak storms are brought by two Legends fighting it out in the skies, or that tornadoes could be someone using a wind ability to stop his foe from hurting him.