the name is actually,''way to dawn''.
I'm not sure but i would guess that sense the keyblade is basicaly the only thing that can kill nobodies and when someone becomes a heartless a nobody is created and everytime the keyblade kills a heartless a hearts is sent up to the kingdom of hearts. and the members of organization 13 need kingdom hearts to become whole. so the keyblade is used to shut the door to darkness and to OPEN the door to LIGHT.
Sora did himself. When Kairi's heart left her body, because it had no darkness considering she was a Princess of Heart, instead of becoming a Heartless her heart entered Sora's heart. In order to release her heart Sora stabbed himself with the Keyblade of People's Hearts, a Keyblade created out of the hearts of the Princesses of Heart by Xehanort's Heartless, releasing Kairi's heart back into her body. However, it also released Sora's heart, which became a Heartless, so he did it to himself to save Kairi.
That's because in Kingdom Hearts 1 when Sora turns the keyblade on himself he turns into a heartless and that created Roxas as Sora's Nobody. Roxas became a part of the Organization of Nobodies Organization VIII and that's what brought the organization into Kingdom Hearts at all. But it was at the End of Kingdom Hearts so they put the organization in Kingdom Hearts Chain of Memories and Kingdom Hearts 2.
Vivi is not a heartless. He shares some design characteristics with them, but Kingdom Hearts was created after Final Fantasy IX, and similarities were probably unintentional.
Nobodies are like alternate people created when someone with a strong heart is turned into a Heartless. For example, when Sora was turned into a heartless, Roxas was created, because Sora's heart was strong.
Xion is a puppet created to team up with roxas so the keyblade's power would rub off on her and then she would get a keyblade... in the long run, to finish kingdom hearts faster...
Roxas is a Nobody who was created when Sora vanquished his heart using the Keyblade of People's Hearts at Hollow Bastion. In the process, Namine was born. Namine is a Nobody that is half of Kairi and half of Sora. Sora turned himself into a Heartless, and when anyone with a strong enough heart becomes a Heartless, the empty shell left behind is turned into a Nobody.*Spoilers*This Nobody, Roxas, was found by Organization XIII and used as a way to gather hearts, since Roxas had control over the Keyblade. After Roxas left the Organization, he was defeated and put unconscious by Riku who then gave Roxas to DiZ. DiZ put Roxas in a virtual town and hid him from the Organization so that he could become one with Sora once again. This is the prelude and beginning to Kingdom Hearts II.For more in-depth information, see the question "How does Kingdom Hearts 358 2 Days end?"
Yes, he was a real character. Whenever someone is turned into a heartless, a new person is created. This is the Heartless' Nobody. Sora turned into a Heartless for a brief period in Kingdom Hearts 1. This is when Roxas was created. Roxas, in basic terms, is the other half of Sora.
Heartless Moon was created in 2002.
Akuji the Heartless was created in 1998.
Heartless Records was created in 2008.
Emblem Heartless are artificial Heartless created by Ansem the Wise for his research on Heartless.