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A Certain Scientific Railgun
From the 2nd Railgun mini light novel "Loli Kihara", aka Nayuta Kihara, a little girl who happens to be a Kihara.
Fans have also taken to calling Heaven Canceler "Dr. Gekota" from Episode 10.
Hey, It's That Voice!:
Amu has become a skirt lifting Heroic Bystander Audience Surrogate named Ruiko Saten.
Uiharu Kazari is basically Yui Hirasawa placed within the Raildex universe and with her appearance changed and guitar skills traded for hacking skills.
Imagine Naomi Nakashima and Seiko Shinohara in a high-tech sci-fi city instead of a haunted school. Then you get Mikoto and Kuroko.
Kurozuma Wataru is voiced by Katsuyuki Konishi, who has also voiced Kamina of Tengen Toppa Gurren Lagann. Fitting too, 'cause both are awesome examples of a Big Brother Mentor.
Nanoha shifted sides, from a befriending Magical Girl protagonist into a one-shot character who's a vengeful yet painfully shy Stealth Expert of an esper.
Banri Edasaki, one of Harumi Kiyama's comatose Child Error students, is basically Ritsu Tainaka thrown into the Raildex universe.
Therestina Lifeline is Erza and Beatrice. The latter connection is made once Therestina .
completely snaps One of Those Two Girls, Wannai Kinuho, although it's not very obvious, is voiced by Haruka Tomatsu, who's famous for her roles as Lala Deviluke, Anjou "Anaru" Naruko, and Asuna Yuuki.
English Dub brings us:
For Railgun S, a lot of new characters, especially Team ITEM, are voiced by seiyuus who have been appearing as major characters in other recent animes:
This one should be pretty easy to spot, but Yuka Iguchi, who voices Index in the main series, sings the ED "Grow Slowly" of Railgun S. fripSide returns to perform the OP of Railgun S, "sister's noise", the vocalist being, also known as Awatsuki Maaya, one of Mitsuko Kongou's followers and Railgun side characters.
Speaking of Mitsuko Kongou, this ain't the first time her voice actress played a Spoiled Sweet Ojou in a series that stars a lot of girls.
What Could Have Been: The author Kamachi Kazuma originally intended for Kuroko Shirai to be the main protagonist, but the studio asked him to use Mikoto instead.