Answer: in the gxp anime the director nabeshin basically wrote over kajishima's plan for nb and used it as his in anime mouthpiece.
obviously no one likes NB in the anime. he is obnoxious
Normally an NB is like Mihoshi's yukinojo, it tells the gxp officer about various things in the area of the case they are working on such as traditions and local laws. After all, if you police the galaxy you're going to encounter lots of odd cultural differences in every place why should the officers have to memorise every place in the galaxy's different laws and social faux pas.
It's not that NB isn't in the novels, but instead rather he is used for his intended purpose...
and on top of that when seina's data infected the academy it met Kirche an Artificially intelligent CGI idol who is the reincarnation of Mitsuki Rara. She falls in love with seina and helps him mostly from behind the scenes... because NB is made from a biometal that can transform into a pretty girl.
