Shin Megami Tensei: Imagine Online (or Megaten) is a massive multiplayer online role playing game based on the Shin Megami Tensei series.
ˇYou can convince, seduce, and intimidate Demons to make them your partners. You can fuse them to make different demons. You can even use them as mounts to move faster.
ˇThe game has a real-time strategic combat, and you can fight with swords, guns, axes, you can use magic and other types of weapons too.
ˇYou can customize your characters with countless costumes, accesories, weapons, and you can change your hair style or hair color.
ˇIt has a detailed storyline quest and regular adventure quests from NPC's.
It's one of A.G.E. (Aeria Games Entertainment) games, and it's free to play.
http://www.aeriagames.com/
http://megaten.aeriagames.com/