A Crown of Stars: In this story Shinji has a degree on Philosophy and Asuka another on Advanced Mathematics. Shinji's time studying Philosophy often comes up, and Asuka has been seen reading up on Mathematics.
The Child of Love: Asuka is mainly a fighter and a warrior, but she is also a fourteen-years-old genius with a college degree. In chapter 7 she could not sortie to fight a giant alien, but she contributed with her strategic expertise and thanks to her tactics her teammates managed to win that battle.
Evangelion 303: Asuka is a commander of the USAF and an elite pilot of experimental jet fighters. Her profession demands not only being a great fighter but also studying a lot, as seen here.
HERZ: Shinji is an Humongous Mecha pilot -and he has been one for the past twelve years- and a music teacher.
The Second Try has Shinji and Asuka becoming milder examples of this trope by necessity, since they had to accumulate and learn the sum total of human knowledge after they're left being the only two humans left alive on Earth, and are pigeonholed into being a civilization of two.
The fic Mortality shows what happens if you really get a mild-mannered doctor like Watson seriouslypissed off. It's NOT pretty. If you really manage to get him pissed, this mild-mannered doctor WILL calmly kill you.
Tara "Green Shield" Strong from DC Nation. Yes, she is a Snark Knight first and foremost, but this is someone who has a Masters at 19, is getting her M.D. by apprenticing under Doctor Mid-Nite, and got her abilities by playing Professor Guinea Pig on herself to try and prevent her crooked boss from taking credit for her work. She's even studying alchemy in order to better keep up with the magical trouble the JSA attracts.
The Pony POV Series has Twilight Sparkle, of course, but there's also Dark World Spike, who's spent the last thousand years as Discord's slave doing pretty much nothing but read to pass the time, from which he's learned a number of fighting techniques.
Harmony Theory: Star Fall is a scholar, magic talent, spy and powerful (by modern standards) mage, able to use her abilities in a fight.
Starr from Pokéumans, despite being seen often in her dorm reading, has certain moments of awesome. The best of which being when they infiltrate Pokextinction's Pine Barrows base.
The Celestia Code features Twilight Sparkle again, as an alicorn. Her approach to dragon negotiation is step 1, offer barter; step 2, carefully applied violence. She also uses applied topography to change a spherical magical shield into a buzzsaw.
In Thousand Shinji, Shinji and Asuka take pride in both their fighting skills and their intellect. Even though Shinji is capable of beating almost anyone in physical combat, he considers his brain is his best weapon. And Asuka is thirteen and she already went to college.
Shinji: I presume then that you want me to help you with your written Japanese. Asuka: If you could. I can help you with your homework, I took most of it already when I was in college. Shinji: (squeaking because she's thirteen) You went to college? Asuka: Yeah, I graduated last year. Shinji: Do you want to lose your virginity tonight? Because I am so turned on right now. Brains, beauty, and a degree in what I must presume is ass kicking, what more could a guy want?
Rodrik Harlaw, nuncle to Theon and Asha Greyjoy, proves himself to be one in Robb Returns. His epithet may be "the Reader", but he is perfectly capable of leading the forces of his more militaristic goodbrother Victorian Greyjoy into a trap, as well as beating the man himself in single combat.