Kingdom Hearts Union Cross

You are a wielder of the keyblade, fight and defeat monsters of darkness called Heartless, which come in different shapes and sizes, and many different elements. Gather little stars of light called lux from defeated heartless, make friends from your union and other unions, rest often so you can keep your strength up, and remember, may your heart be your guiding key. P.S. Just write your character's name when the "user" prompt pops up, I cannot for the life of me find where it is.