My imaginary partner would be a:
Skinny, dropout upper class white boy of mixed western european racial type with wavy dark brown hair, a meaty kind of hobbit-like nose, really skinny giraffe neck, sleepy hazel brown eyes and pale yellowish skin. He would dress kind of like me, in a little decadent dressy/dandy look mixed with broken preppy. He would have some nerdy childish interests like video games and anime and prefer to stay at home in the big luxury house to just play games/watch anime for an entire day. He would love shopping, like me, be extremely sarcastic and condemning in everything he said. His humour would be joking about other people's appearence/weight etc and he would sometimes act a bit like a sociopath. His sexuality would be kinky beyond belief. He would have a "me against the world" mentality and think he could abuse laws because he was rich and he would lose his temper and act childish if he didn't get his will.
Everything we did would be unconditional. We would go on road trips decided with just a few hours notice or board planes for Brazil if we got bored one afternoon but most of the time would be spent slacking, watching anime or discovery channel, internet shopping and trashtalking other people, trying to best each other in who could be the most sarcastic. Someday we might both have gotten involved in politics.
That's my mental, unrealistic image of a relationship.