This game is not a massively multiplayer game.  You play individual matches with whichever Demigod you want, and start at level 1 every time; if the match goes on long enough, you will eventually reach level 25.  The next time you play, you will be back at level 1.  The game isn't the usual RPG.  You don't have "worlds", just arenas.  Some arenas will be able to have 10 people at once, some ony 2 or 4.  However, many people can play on "copies" of the same arena at once.  It works like RTS games where you have a set number of maps that you can play on against a small number of people.  There is also going to be a persistant mode where your Demigod gets stronger every match, but that is not really the main mode, from what I can tell.  There isn't a vast world, just ~8 arenas.

You can choose the Queen of Thorns (fairy) as your Demigod whenever you want but you can only customize her spells, not her appearance.