I've made a characters/seiyuus page for Touka Gettan, with pics of the seiyuus of almost all the named characters, along with info about them and pics of their characters.
I haven't been able to find pics of Hayami Saori (Momoka) or Yamagata Satomi (Kikyou), so if anyone knows where to find them, please let me know. ANN claims that Yamagata Satomi 山県さとみ is the mangaka Yamagata Satomi やまがたさとみ, who among other things does yaoi manga. But I have my doubts.
And if you haven't heard, the official Touka Gettan staff blog confirms that the series will be 26 episodes long, and that it will continue to run "backwards" right to the end, with each episode ending where the previous one began. This bizarre arrangement is working surprisingly well for me so far. It is like a voyage of discovery -- into the past.