Riku-Keyblade as on the main page u see this right
(---The keyword "memory" also appears, but what in regards to this?
Nomura: The catch copy* of this game is "I can't remember, something important". Though in the original Kingdom Hearts the concept was to "illustrate the heart". In regards to the relationship between one's heart and one's memory, it is intimate. In this game the main characters are nobodies who don't have hearts, therefore the theme of memories is featured)
if memories are in hearts how can nobodys just have memories without hearts
Uh, Nobodies have memories because they're the ones who obtain their somebody's memories.
But Roxas is an exception of this, because Sora remained a Heartless for such short time.
if nobodys are still linked to there heart why dont they have emotions then
Uh, Roxas has emotions, being a special Nobody.