Hmmmm.
One doesn't unimagine a tulpa. Once it exists, it does. It has a short 'lifespan' but the person interacting with one has no control.
Where does it appear? It depends where it is sent. If it's sent as a personal attack then it arrives wherever the target is. If it's being created as an 'experiment' then the creators must define it's form and place it appears.
Like a ghost, tulpa can be where they are meant to be.
Can it, as you infer, be used as a 'hunter'? Yes. Definitely. But it has a very short 'lifespan' (and I use the word 'life' avisedly since it is an artificially created form) so the amount of energy the creator uses to make it determines how long 'they' have got. You set a tulpa as a hunter, then you make sure you know the general geographical location of the target, you invest bucket-loads of spiritual energy in just it's creation and set it loose.
Two things I will impart that I've learned:
Firstly, if the tulpa/hunter is near to 'burning out' before finding it's target, it will attempt to return to it's creator - it's creation depends on harm or destruction. It doesn't go willingly.
Secondly, creating a tulpa doesn't make you it's controller - it has it's mission, if you will.
As I've been told ... if you open the box, make sure you know how to close the lid.
Anyhow, this is all getting a bit too strange ...