>>42637409
>Is this a legit Tupper?
Yup, that's how it starts, then the force of habit makes her more real and seemless.
Then it's up to you about what kinda tulpa you want, either an extension of yourself as >>42637698 puts it.
Or with more practice / talking / having her around without paying too much attention shell grow independent and her own being.
This is all up to you, it's as simple as "I want her to be pinkie pie" then she'll be pinkie pie.
Bonus points for autistically obsessing over her own life / world.