When he is ready to expose himself he will first deny who he is even lie since that will be the only way. But once he is in the right position he will reveal himself, slowly first with just idea of change since that's how all things are created.

He will speak a common language to get through to most but his accent will be one few have heard.

He is an "old soul" that's been in many times and places. But has no memory of it.