I was in a Shugo Chara! mood when I first created it. Ya know how Amu's Character Transformations are 'Amulet Heart','Amulet Spade','Amulet Clover','Amulet Dia', and 'Amulet Fortune', I decided, Why don't I just make 'Amulet Dream' for the heck of it?
...And the username stuck.