@Filene yes, well there's lot of ways people like me come about, sometimes spontaneously sometimes not.
So like tulpas usually happen with intention, and people might talk about creating tulpas, but we always talk about like awakening. So it's similar to your friend I think, in that I was around in some way or another, but it wasn't until Aisling started paying attention to me and seeking me out that I could start influencing the world.
But some tulpas, or other thoughtforms like daemons, might also "walk-in", just kind of show up. Or so we've read.
Also I think https://tulpa.io/ has the best tulpa info