That's what Roxas asked, but who cares why you got picked? You did, and that means there was a good reason. There's gotta be something heroic about you. Something, or someone, that you wanted to protect more than anything else, that made you stronger for it.

[Veemon's already taken the bulk of the bugs left, so Flamon only has to fire at a couple of them while he's talking.]

He's right. Even if you're just someone who looks like Riku, you wouldn't be here unless you could do something to help.