Make a girlfriend?

"I'm looking for a boy like Koichi" is a correct sentence. But, "I'm making a boy like Tsuyoshi" is rather strange.

In Japanese, people say "Make a girlfriend/boyfriend" (Kanojo/Kareshi wo tsukuru). In English, people usually say "find a girlfriend/boyfriend." As you know, a girlfriend/boyfriend is not what you will create. But, whey do the Japanese use this expression? Maybe, they need to make some efforts to find a girlfriend/boyfriend.

Well, but if you were a mad scientist who could make a human being, this sentence would totally make sense. Jessica Alba isn't human in "Dark Angel."