This is how Ryan finds out that he's a Toa goes in Ryan's, Thomas' and Crash's Adventures of Bionicle 2: Legends of Metru Nui.
Ryan F-Freeman: Ok. I don't know what happened to me. We came to this world.
Ryan F-Freeman: Oh, Thomas. I need to find a mirror to look at myself.
Ryan F-Freeman: Boy. I hope my reflection is there.
[Ryan looks in a mirror. But, instead of his reflection, he see
Ryan F-Freeman: Huh? Am I seeing a Toa?
Ryan F-Freeman: Who are you?