Neru Akita (亞北ネル Akita Neru) is an officially recognized derivative. Her name is a play on words: Akita (亞北) is taken from "飽きた" or "get bored" while Neru (ネル) is from "寝る" or "go to bed".
On October 14 of 2007, when the Miku movement was on the rise against the expectations, a Japanese TV suddenly broadcasted a program that put down Miku users as "anime freaks without stable work experience". Three days later Miku pictures became unsearchable on main search engines such as Google and Yahoo! Japan, and on 19th Miku's article was deleted from the Japanese Wikipedia.
These news widespread or "flamed up (炎上した)" on 2ch bulletin boards with the rumor that an advertising agency which had a strong influence on the Japanese music industry was behind the series of "anti-Miku negative campaign" in an attempt to perge Miku and indie musicians from the music trend. Then tons of comments which denied the rumor or "put off the fire (消火する)" were posted followed by the phrases "飽きた、寝る。 (Got bored. Going to bed.)" or "寝る、お前らも寝ろよ。 (Gonna go to bed. Follow me, y'all!). Yet those comments drew nothing but negative responses from 2ch netizens. The contributors were branded as "puppets of the agency". The netizens joked the "puppets" and made a spoof character for these posts as "Akita Neru". Later Smith Hioka, a designer, finalized the concept art of Neru. She has come to represent the tsundere culture of Vocaloid.
Google and Yahoo!Japan announced that the search failure was a technical problem and had nothing to do with the advertising agency or the TV program. The Wikipedia page removal was the result of copyright violation, which also had no relation to the agency. Still the rumor about the "Miku-hating agency" is going around in Japanese fandom now.
On April 1 2008, Crypton adopted Neru as an official derivative character of Miku.
Due to Neru proving to be one of the more popular Fanmades, appearances of her have warrented some consideration for promotion.
Official licensed Neru figurines have been produced: a Nendoroid Puchi and a 1/8 scale model.
Neru makes a cameo appearance as a music teacher in Maker Hikōshiki Hatsune Mix (ch6), but she will, later on, appear again in the story; this time as a salesperson (ch7).
In Project Diva Neru is an available character in the PSP game, Hatsune Miku ~Project Diva~ and again as a playable character in its sequel. Her appearance in the first Project Diva game did not carry her "official" personality, and was as cheerful as Miku. This was corrected in Project Diva 2nd, complete with tantrum-throwing if the player has not chosen her for a long time.
Neru officially has no defined voice, however this has not prevented users from attempting to give her one. In some cases Neru has the voice of a boyish-sounding girl, while some people have assigned her to Miku's default voice, but in a higher octave. Although people use the higher pitched voices as a representation of Neru, her voice has been portrayed in Project Diva 2nd as being a lowered version of Miku. Another suggestion also uses Rin. This was first used in Nanamue-P's Honey Honey PV, Neru has a singing voice that better matches her aesthetics.
- Neru is regarded as a "BOUKALOID" (in Japanese, 防火ロイド or 防火LOID) - a play on words. It literally means Fireproof-loid and has the same pronunciation as Vocaloid in Japanese.
- Neru's history, including her DEN2 arm marking, is extremely controversial due to the involvement of a supposedly-powerful entity, and this matter was asked not to be expounded for the safety of Neru's creator.
- A prevailing fan description is that Neru is employed in a writing agency for a rate of 700 yen per hour. It is said that the IP address of so-called "puppets of advertising agency" belonged to a company which hired part-time workers for the rate. Yet this is nothing more than another unconfirmed rumor.
- She sometimes speaks in Tohoku dialect or Akita dialect. People speaking in such dialects are located in the Tohoku region. This is a reference to her family name Akita, and the prefecture's name.
- Like Miku, Neru also has a futuristic ribbon in the shape of a blue circle holding her side tail in place. This does not need to physically touch Neru's hair to keep it in place. This is also one of the most difficult parts of Neru's outfit to recreate for cosplayers.