Quick answer — Kiyotaka Haimura worked on A Certain Scientific Railgun T (Original Character Design), A Certain Scientific Railgun S (Original Character Design), A Certain Scientific Railgun (Original Character Design) and 12 more anime.
Kiyotaka Haimura worked on A Certain Scientific Railgun T (Original Character Design), A Certain Scientific Railgun S (Original Character Design), A Certain Scientific Railgun (Original Character Design), A Certain Magical Index II (Original Character Design), A Certain Magical Index: The Miracle of Endymion (Original Character Design), Toaru Kagaku no Railgun: Misaka-san wa Ima Chuumoku no Mato Desukara (Original Character Design), A Certain Magical Index (Original Character Design), A Certain Scientific Accelerator (Original Character Design) and 7 more.