 If you liked
Kimi ni Koishite Ii desu ka.
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 ...then you might like
Real Girl
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Although both series follows different premises, the main male character has a similar personality with their timid nature. They aren't very popular with others either but they share a rather peculiar relationship with the main female protagonist. As such, both series focuses a lot on the MC's development. It fleshes out their personalities through the role they have in the story along with the connections they build with others. There is romance in both series although 3D Kanojo relies a lot on more drama.
Main guys are very awkward about life, and girls in particular. They get the attention of girls that are very good with people and start to develop social skills. The pacing is about the same, too. Other than that, 3D Kanojo's protagonist is more geeky and KNK's protagonist is more of a tough guy. I like both characters though.