Just for the record, I did go check. Kira's apparently not in the books, but was a new invention for the anime. So somebody made the deliberate decision to incorporate this embodiment of... certain otaku preferences into a show that, up to this point, had never had any characters who looked like this. I'm just pointing out that this is what occurred.
AND YES, I RECOGNIZE THE FUNDAMENTAL SILLINESS OF ME BEING THE ONE TO QUESTION THE INCLUSION OF CUTESY CHARACTERS. You still get what I mean, right?