probably happened in KH1 when destiny island got attacked by heartless
That giant dark ball in the sky at the beginning of KH1 summons Heartless to destroy. Later in the game, Riku realizes that it has a Keyhole.
Roxas was "made" when Sora turned into a Heartless, towards the end of KH1
Well, Riku (if you are talking about in KH1) was possesed by Ansem, or Xeharnorts (I cant spell it lol) Heartless. It was not really him. Riku was never bad when he was actually not possesed.
go to lyrics.com and type in heartless
114 soras or surats (or chapters in English).
roxas was always soras nobody, and he formed when sora became a heartless, because sora's heart was so strong, roxas was formed and then joined organization XIII and supposedly there was a 14th member of organization 13 so basicaly in 358/2 days its organization 14 then 13. sorry if i spoiled 358/ 2 a little.
he was never born he was created by a witch named namine, namine was a person who was able to restore soras dreams by using roxas, but actually roxas was meant to be created to be in 0rganiziation 13 and help defeat heartless.
Well, Kairi doesn't actually have a Heartess...but Namine is her "Nobody". According to the game a "Heartless" is made when a person yields to darkness and the vessel that has been left with no heart becomes a "Nobody". If you can remember at KH1, Sora gave up his heart for Kairi turning him into a heartless. Since Kairi lost her heart and didn't become a Heartless, she only has a Nobody which is Namine.(my theory for Namine's ability to control the memories of Sora's heart was because of Kairi having Sora's heart and vice versa, their hearts are directly linked.
If you go to the address below, there is a list of heartless from all the Kingdom Hearts games: http://kingdomhearts.wikia.com/wiki/Heartless
Blue
press sart go to your deck and add cards of heartless