>>42714875
>homonculous
Surely you jest OP, what did you mean by this?
>Hard to have a relationship with a ghost.
Not really. The nature of the relationship is obviously rather different but everything that matters - love, connection, activity, presence - all of those work fine. The basis of all those things is psychological and can be disconnected from any physical referent. As >>42715122 says, you can go further and hone your imagination to a very high degree, but that's work. The relationship part is easy and natural.
In general before I launch into serious tulpafag rambling I want you to tell us a little bit more about your relation to pony and what drives you to pursue the weird. Are you a newfag who fell in love over the anni? Are you an EQG convert? Was the homonculus thing a joke? Your opening post is rather ambiguous.