It depends on who "Ansem" is, because there are really 3 different "Ansem"':
Since all Nobodies are created from the creation of Heartless, Xemnas is the Nobody of Xehanort's Heartless, Ansem.
Xemnas was Xehanort's Nobody.
its ansems the wizes student xehornt or after sora deaftes him xemnas
Xehanort
Xemnas is the nobody of Xehanort, and the founding member of Organization XIII. Because of possessing the highest-ranking status among the fellow members of the Organization, he is referred to as "The Superior". Xemnas harnesses the element of Nothingness with his weapons known as the Ethereal Blades. Xemnas has command over the Sorcerer Nobodies. For more detailed information on Xemnas, please visit the link found below.
Xemnas does not exist in Kingdom Hearts 1, but he is the leader of Organization 13 because of Ansem in Kingodm Hearts 1. Xemnas is a nobody so there for he does not exist without someone to live by that was once part of the darkness. Therefore when Riku became part of Ansem in the Darkness Xemnas was born a nobody. Also when Sora became a shadow to save Kairi's heart Roxas was born therefore the keybearer for Organization 13.
"Xemnas" is "Ansem X", following the trends in all Organization XIII's nobodies' names (ex. Axel = Lea X, Roxas = Sora X, etc.), shows that Xemnas is "Ansem"'s nobody. This is the "Ansem' from the first game, NOT Ansem the Wise. Fangirls often reverse the letters in "Xemnas" to spell "mansex" instead of "Ansem X".
Xemnas has recollections of his past life as a human being. One he surrendered himself to darkness both his Heartless and Nobody form was created. So, if this be the case, then Xemans definitely knows about his Heartless form.
Ansem the Wise is Ansem the Wise, he is nothing else, he pretended to be Diz in Kingdom Hearts 2, and he didn't show in Kingdom Hearts 1, the Ansem you fight in Kingdom Hearts 1 is actually Xehanort's Heartless, Xehanort is Ansem's apprentice, that became a Heartless, and the Nobody of Xehanort is Xemnas. ------------------------------------------------------------------------------------------------- WRONG!!! Xemnas is Ansem's Nobody... Get rid of the x and switch a few letters around and you get ansem's name.... Not xehanort... FYI... ansem was DiZ... AND......... in kingdom hearts you didn't battle Ansem... You didn't battle xemnas... You battled xehanort that was pretending to be ansem... But it turned out that the REAL ansem was just trying to HELP sora... ----------------------------------------------------------------------------------------------------- The first answer was right. Xemnas is Xehanorts nobody. Think about it... they look alike and had somewhat the same goals.
you don't. But with that being said you can play as Riku in the xemnas Light and Darkness battle. It's the one where xemnas is in kh and it's only you and riku. It's final form xemnas as my friend blank said. And just to let you know there is like 5 final boss battles including the kh nobody dragon.
Xemnas looked like Terra from Kingdom Hearts: Birth by Sleep when Xemnas took over Terra's body.
Very complicated. His true name is essentially Xemnas. But, if you mean as a human, he took the name of Ansem, but his true name was Xehanort.
When you fight Xemnas Sora will get captured at some point and Xemnas will drain his HP. You'll have to be Riku to save him.
i think that sora would beat any body's butt in anything that he did (maybe even riku) and i think xemnas and Darth Vader wouldn't even fight cuz it would be all like... Darth"xemnas i.. am... your father..." xemnas" NOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO..... but you... you killed my mother.." Darth.."ummm.. no that was my twin brother"xemnas"o.. DADDYY!!!!"