Interesting interview with the lead writer for Ichiban Ushiro no Daimaou, Yoshioka Takao, on the Japanese site Hobby Channel.
The show is a harem comedy including strong adventure elements, set in a school for magic, and including plenty of inventive fanservice. One of its strong points is the energetic pace it maintains.
Asked which character he liked best, Yoshioka-san said Akuto (the protagonist), that he was someone who went straight ahead, even at the risk of blowing himself up. He said Akuto just had a good feeling about him, and he felt no stress at all writing him.
What scene did he like? The classroom scene in episode one where Akuto was introducing himself. He thought that director Watanabe Takashi and star Kondou Takashi worked as a perfect match in that scene, to introduce the character and the situation.
What was the hardest part of doing the show? As with all light novel adaptations it was condensing the story and dividing it into twelve 25-minute episodes, when the original was not divided that way.
For establishing the characters, which he felt were very well established in the novel, at the beginning in particular he used monologues by Akuto to set who he was and to emphasize the humorous misunderstandings. That way he could kill two birds with one stone: showing who the character was and avoiding boring exposition.
He was asked about the fanservice scenes, and what had to be emphasized there. He answered that there wasn't that much fanservice in his script, and that he himself thought that overdoing panty shots reduced their impact. (He was the writer on Sky Girls and Queen's Blade, so I'm not sure what this means.)
He said that the cast hadn't been set when he wrote the script, and that it was a big surprise to him when he saw Yuuki Aoi (the seiyuu for Korone) standing there in her school uniform saying "this and that" (Korone's lascivious lines). He said it pained him to see it. "But she graduated from high school during the recording, so it was okay after that." The writer of the interview comments in parentheses: "Whaat?"
He was asked for a comment to readers, and said that in this world, with its ups and downs, if the anime can bring people a moment of pleasure, he will be happy to have been a member of its staff.