i was watching the new scenes of KH2FM and as we know Aqua is in the room of sleep and Xgbar was talking with Zexion about stuff and Xigbar said that the other Friend might be at the room of awaking i bet its terra

i bet its not /shotshot Xehanort the apprentice looks too much like terra to not be some form of him, so i doubt xemnas is looking for terra.

 

And in Days Xigbar simply says that the other room will hold the secrets or something cryptic like that, doesnt he? I dont know, i have a dreadful memory lol.

I believe in my opinion that the Room of Awakening holds Ventus's armor, but I am just guessing. Xigbar is a character that is kind of confusing and teasing. He knows a lot and Nomura said that "Pay attention to Xigbar in particular. Although, when you think you understand his true nature

I agree with Cricket. And especially in 358/2 Days, where Xigbar fought Xion on Day 353, where Xigbar saw Ven as Xion (because she looks like different people because people who met Sora became a memory of his, and people who have seen the person before will see that person, or something along thoses lines). Which means the "other friend" must be Ven's armor.

late to the party...(spoiler alert) yes it is ven do to the fact that aqua turns land of departure into castle ovlivion

...sorry...to protect ven from terra who is possessed by xahanort