nyarlathotep_(nyaruko-san) -> nyarlathotep

Reason: same character.
Or maybe choose one tag to use and change all posts under the other. There are only ~40 under each of them.

Tried but it won't create for me.

Done. All have been retagged to nyarlathotep, since there was already a wiki entry for nyarlathotep referencing haiyore! nyaruko-san.

Just for the record I didn't find the need to qualify it because the odds of someone cosplaying the actual nyarlathotep are basically zero.