Xigbar/Luxu (Kingdom Hearts)

"'Oh, kiddo... how wrong you are! You or your friends don't even realize that I've been in this game before you were even born, sister! As if I'm gonna let you ruin the plans I've- 'WE' put into motion! Now, let's dance sweet-cheeks!' - Xigbar/Luxu, before engaging Mina in a fight during the events of the 'Linked into One' crisis."

Xigbar, (The Freeshooter), is the Nobody of Braig and formerly Rank No. II of Organization XIII. His original persona Braig was a former apprentice to Ansem the Wise and the head commander of the Radiant Garden Royal Guard Corps - though he later betrayed both parties to serve as Xehanort's spy/loyal cohort for the foreseeable future of opening the door to Kingdom Hearts.

In reality, his role within the Organization and pact with Xehanort was a ruse to hide his true goal - re-obtaining the 'No Name' Keyblade and progressing forward with his own unknown agenda. It is later revealed that he is the vessel of the ancient Keyblade Master Luxu and a fellow friend/teammate of the currently missing Foretellers.