Ven is a new character from Birth By Sleep whom bears an uncanny to Sora's Nobody, Roxas. I think they are the same person although Birth By Sleep occurs ten years prior to the first Kingdom Hearts game. Here are my reasons for thinking this. I'd like a good debate about this and will start a topic about XIV in Organization XIII too. Remember it's a debate, not an argument.

- In a video of the game, Ven asks Terra to erase him from this world.

This makes me think that Roxas has been taken out of his timeline with the Organization prior to being put in the fake Twilight Town by DiZ. He is given a new name in order to hide him from Master Xehanort in case he somehow learns that Roxas & Sora play a part in his Heartless' and Nobody's downfall. He has been taken to Birth By Sleep timeline because he is another Keyblade wielder, and needs to choose a third to wield his Keyblade, much like Terra and Aqua have to.

In this instance, I think Terra chose Riku to use the Kingdom Key, but as he accepted the darkness, Sora recieved it instead hence Terra's line in Final Mix of "I didn't choose you". Aqua chooses Kairi to use her keyblade. Ven chooses Roxas (i.e. himself) to use his keyblade, granting Roxas (and eventually Sora) the ability to use two keyblades (already being a Nobody of a person who can use a keyblade and being a chosen Keyblade bearer). Master Xehanort whom also has a Keyblade, chooses Sora to hold his keyblade after observing Terra's choice between the two boys he sees on Destiny Islands, but as Sora recieves Riku's keyblade instead, Riku's recieves Sora's intended keyblade.

- This screenshot
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Matches the official biography face for Roxas, which can be seen here.

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Your thoughts please. :-)