A character who starts out not being nerdy is persuaded to try something nerdy, and winds up liking it. Unisex Trope, since some of the examples are female.
Examples of Converted Fanboy include:
- Genshiken averts this trope with Saki, who never turns Otaku regardless of how much time she spends hanging out with the club. It's played quite straight with Sasahara's sister Keiko, though, who is completely dismissive of otaku culture until Ohno lends her some Yaoi porno. Keiko enjoys this so much that she eventually fully embraces otaku culture, apparently enjoying her sexuality more as a pervert than in the mainstream.
- The plot of the first part of Otaku no Video.
- On Freaks and Geeks, the title geeks got Daniel into Dungeons & Dragons.
- On Pretty Little Liars, Hanna got into nerdy computer stuff when she started hanging out with Lucas.
- On The Big Bang Theory, Sheldon introduces Penny to Age of Conan and she becomes completely obsessed with it.
- They also introduce her to many scientific concepts, such as Schrödinger's Cat, that she brings up later on her own.
- On The IT Crowd, Moss gets Douglas's rowdy business associates to play Dungeons & Dragons with him and Roy. They end up loving it.
- Subverted on How I Met Your Mother. Try as they might, the guys just can not get the girls to appreciate Star Wars. When Ted is dating Stella, Marshall explains to her that, to Ted, Star Wars is not just a movie, it is a way of life that he has watched and will watch again until the day he dies. If she is only pretending to like it for his sake she will need to keep up this charade forever and will need to endure it on good days and bad, in sickness and in health, for richer or for poorer, till death do they part. Can she do that? Yes, yes she can. At least, she can until she leaves him at the altar.
- Mark from Weregeek would have been this if he hadn't had a natural predisposition towards geekiness long before he was discovered by the local geek community. He just didn't know that he would make a great geek until he became one.
- Not too long—it was the first time he succumbed to the full moon (Our Weregeeks Are Different).
- In an episode of The Flintstone Kids there was this one time where the brother of one of the kids or something was persuaded to watch an episode of Captain Caveman. He loved it.
- My Little Pony: Friendship Is Magic seems to have this effect; many comments posted about it run along the lines of "What is this girly nons-HOLY CRAP THIS IS AWESOME!"
- There's also an in-universe version in 'Read It And Weep', where Rainbow Dash resists trying the book Twilight suggested she read because she believes reading is for eggheads which Rainbow Dash is definitely not. Eventually, the boredom of being stuck in a hospital room with nothing to do gets to her, and she tries it...and ends up loving it, of course.