Only the Emblem Heartless (the ones marked with the red-black heart) release hearts when destroyed by a Keyblade.
As Axel explained to Roxas, Heartless that are destroyed not by the Keyblade regenerate back into Heartless. However, the Keyblade has the power to release the hearts to Kingdom Hearts.
Emblem Heartless contain and release hearts when defeated by the Keyblade. Purebloods, like Shadows, don't release hearts.
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.
A Heartless is a fictional enemy in the video game Kingdom Hearts. The Heartless are emotionless and empty creatures that devour worlds and embody everything that is darkness. There are two different kinds of heartless:Pureblood Heartless and Emblem Heartless.Pureblood Heartless are the most common, but have a small range of species. Common pureblood heartless include Shadows, Neoshadows and certain bosses like Darkside. Pureblood Heartless do not release hearts, unlike the Emblem Heartless. When a Heartless is destroyed, it's heart gathers with other hearts into an entity known as Kingdom Hearts, which is often used by the antagonists of the game.Emblem Heartless are a sort of artificial Heartless that have a symbol of a heart located on their body. They have a wide variety of species. The Emblem Heartless must be destroyed by the Keyblade, otherwise the hearts they release will gather back into Heartless again.
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.
KH keyblade wars [kbw] is before the original kingdom hearts and it tells the story of a keyblade master, and instead of heartless and nobodies theres unversed, which are blue with red eyes.
well you beat one with the keyblade. the only time you become one is near the end
The question isn't very descriptive; to defeat any Heartless, all you have to do is attack them with the Keyblade.
the name is actually,''way to dawn''.
On the night of the second day on Destiny Islands. A storm happens, and you have to find Riku's outside. Shortly after, you get the Keyblade. Note: Until you get the Keyblade, don't try killing the Heartless, the wooden sword can't harm them at all.
Pureblood heartless release no hearts when you defeat them. While Emblem heartless ( the ones with the heart with the X mark) actually releases hearts and in 358/2 days, Roxas collects those hearts.
Kingdom Hearts III: The Keyblade Wars is a fan made cover desgin.It is not a real game.