well there are a few answers to this. if your talking about in the first game, then he looked like a normal heartless. in the second game he has to fight his dark side or whatever, then that looks like him but just black.
no way
Riku-Ansem is identical to Ansem, which is the Heartless of Xehanort.
No. Xehanort's Heartless (the fake Ansem) looked like Ansem the Wise (the real Ansem) but a lot tanner.
It was just a regular shadow. A bit strange, cause you would expect that someone with a strong heart like Sora would leave behind a very strong heartless.
Multiple heartless are heartless! Just like fish or sheep.
The one we know of as "Ansem" is Xehanort's Heartless. He shares some characteristics, such as obvious similarities in clothes, but is very different in appearance.
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.
Because when Riku went into the Door to Darkness, the darkness consumed him, so he could use the powers of the dark, look like Xehanort when he was a heartless, and a darkness keyblade.
King Mickey told Ansem about Heartless, so Ansem was too intrigued to not look into them.
I think you might be reffering to Vanitus, who is Master Xehanort's apprentice in Kingdom Hearts Birth By Sleep......i'm actually not sure WHO he is exactly but, he looks JUST LIKE SORA, but yellow eyes and black hair. Or you might be tallking about when sora turns into a heartless in Kingdom Hearts 1, just after defeating the evil riku, and sacrificing your heart to save kairi's, then in that case, you are called Shadow. so either Vanitus, or Shadow, a common heartless.