When does a character Who Leads get her Follower?

If a PC picks up the Leads focus when translating to a new recursion, when does her Follower show up, and would the character recognize him as such?

Is the Follower an actual native of the recursion, or does he only exist while the character is present (and has the Leads focus)?

If she then translates to a different recursion or a prime world, then returns to the Follower’s recurion, is that Follower waiting for her, does she have to seek him out, or does the Follower somehow “know” that she has returned, and seek her?