Xemnas' First Appearance: Dream Drop Distance
Xemnas does not first appear in Prankster's Paradise. Xemnas first appears in The Grid to taunt Sora about the fact that Rinzler and he are similar in that their personalities were overwritten by others. Afterwards, he appears in PP. - CheesyGranola
The name of Xemnas's Etheral Blades are called "Forbidden"