he is marluxia, leader of castle oblivion.
Marluxia was only stronger than the rest of the Castle Oblivion residents of the organization, so Marluxia isn't stronger than all the other members. He was only stronger than a little over half of the members. He was seen as a threat by Xemnas and Saix and was sent to Castle Oblivion under the secret supervision of Axel. Little did Marluxia know that he was meant to be killed by Sora.
Vexen disobeyed Marluxia and personally crafted the Twilight Town memory card and a replica Twilight Town to reveal Marluxia's plan to Sora, because he always felt tension between the aboveground/underground members of Castle Oblivion. Consequently, Marluxia ordered Axel to eliminate Vexen when Marluxia found out.
Before entering Castle Oblivion, a mysterious hooded figure tells him that in Castle Oblivion "To find is to lose and to lose is to find". What he meant is that Sora will be losing memories while gaining fake ones created by a witch named Namine. While in Castle Oblivion, Namine is slowly taking away Sora's memories and adding fake ones. Hence the title "Chain of Memories". Marluxia commands Namine to erase Sora's other memories so that that he can harness the power of the keyblade master, controlling him like a puppet. While in Castle oblivion, Sora goes through fake worlds in the form of cards created by Sora's memories. Every time that he progresses through a world, he goes up one floor in Castle Oblivion; losing more and more memories each time. Marluxia's plan fails when Sora learns of Namine's actions and defeats Marluxia and the rest of the above-ground members of the Organization.
The whole Castle Oblivion crew- Marluxia, Larxene, Zexion, Vexen, and Lexaeus. The first three are my favorite characters. :(
I believe that you can only find him in final mix which is available only in japan
You need to have addon
It is impossible for Roxas to love Namine, for multiple reasons. The first, and most obvious reason, is that Roxas and Namine are both Nobodies, and therefore lack the capability to "love". The second reason is that Tetsuya Nomura (Director/Character Designer) has stated that NO in-game relationships will occur within the series.
just get battlehorn add on
It's impossible to get to Castle Oblivion in KH2, but it does appear in a flashback during the beginning of the game while you play as Roxas.
It is assumed he has "Faded from existence". As Axel previously states when getting rid of Vexen: "Nobodies don't die, we just cease to exist." But many assume this is "Death" for the character. And the last time we assumed a character dead we had to save the world from Xemnas, THE OTHER HALF OF ANSEM. But Sora defeated Marluxia in Castle Oblivion and he "faded from existence". Whetehr the character, in some shape or form, will be returning the the series is unknown and unproven.
I Okay Well Xemnas Dies At The End Of Kh 2 When Sora Defeats. III Him Xaldin Dies At The Beasts castle After A Boss Battle.II Xigbar Dies At Castle oblivion. IV Vexen Dies In Kh COM.V I Think Lexaeus Dies in Kh Com at Castle Oblivion With Vexen.VI Zexion Dies In Com As Well.VII Saix Dies At Castle OBlivion In Kh2. VIII Axel Dies In kh 2 in The Inbetween Road (Between Castle oblivion and That Town You Start At In kh 358) In kh 2.IX Demyx Dies In Hollow Bastion In Kh2.X Luxord Dies At Castle Oblivion.XI Marluxia Dies In Com.XII Larxene Dies In Com.XIII Roxas Dies In The End of kh 358/2days When Riku Kills Him.XIV Xion Dies When Roxas Kills her.