Who do you believe are the three charactors in KH2 secret ending?

[Ouch!]

I've been thinking about this too. After I saw the secret ending, I got a little curious and looked up the word "Chasers." A chaser is someone who engraves symbols or shapes on metal. That includes making keys.

This is perhaps the most logical theory that I've seen pop out of this whole secret scene. Props to you.