What I meant about "accidental tulpa creation" is that sometimes I accidentally create "stubs" that can become tulpas if I actually took the effort to keep following the process of creating one.
Also, I think that neurons in your brain will be rewired so that after you create a tulpa, you might have enhanced audio/visual imagination. Prove me wrong, but this is what I assume.
The process of creating a tulpa would be easier when I was 8-11 than right now, because my audio/visual imagination was way better back then than now.