Kono Kanojo wa Fiction desu and Ashita Dorobou are very similar series. In both of them an "ideal" girlfriend (one based on male leads imagination, though in Ashita Dorobou she also had a living model) appears out of nowhere (more like comes into existence). The girl is however more to handle than the male lead would ever imagine, since she fires laser beams from her eyes when she is angry and she is quite possessive (if only all yandere were this adorable). Also, both series feature a love triangle. If you liked one of those two series you just have to read the other one too.
P.S. Those series are not as generic as their descriptions may sound.
A fictional 2-D girl comes to the 3-D world, but she ends up being completly different from how she was on paper. Both series are extremly funny, but Gou-Dere Bishoujo Nagihara Sora is also extremly dirty (read it at your own risk).
A guy wrote down his "ideal" girlfriend and POOF for some reason she came into existence. But while she loves him nearly unconditionally, he is reluctant to love her back, because he already has a crush on someone else (read love triangle). That's more or less the plot of both of those series, so fans of one of them might find the other interesting too.
Note: Kono Kanojo wa Fiction desu has bits of ecchi, while Fantasy Maid is awfully cute (and a bit smut later on).