WARNING: THIS IS KINDA LAME XDDD and SENSELESS
Okay, ill be quick... I belive Xion is just a Fake Memory Created by namine, Just an ilusion created by her power over sora´s memories and those around him, this could be the why, shes never mentioned on the other games... I´ll Explain further... In ReCoM, when Namine Changed Sora´s Memories, everyone else memories (Kairi, Etc...) were affected right, I belive that when she changed Sora´s Memories, Also Roxas´ memories could have changed... so in the cutscene of days when we se roxas lying on a bed and xemnas tells to saix something like "The effects of namine... " or whatever.... I belive that roxas´ memories were beeing affected, So in other words I belive that days its just a Long LONG Memory and that everyone else can see xion because theyre conected to roxas and roxas is conected to sora.!
Okay, ill be quick... I belive Xion is just a Fake Memory Created by namine, Just an ilusion created by her power over sora´s memories and those around him, this could be the why, shes never mentioned on the other games... I´ll Explain further... In ReCoM, when Namine Changed Sora´s Memories, everyone else memories (Kairi, Etc...) were affected right, I belive that when she changed Sora´s Memories, Also Roxas´ memories could have changed... so in the cutscene of days when we se roxas lying on a bed and xemnas tells to saix something like "The effects of namine... " or whatever.... I belive that roxas´ memories were beeing affected, So in other words I belive that days its just a Long LONG Memory and that everyone else can see xion because theyre conected to roxas and roxas is conected to sora.!