Although anime-girl-like look young and childlike, and frequently even have a childlike personality, all anime-girl-like girls have an above average intelligence(IQ>100).
It is known that anime-girl-like don't have male counterparts.
It is said that anime-girl-like girls were first created by a laboratory in a technology-advanced world of human beings, as a result of the research of immortal genes, and they originally had their homeland, however, it is known that some anime-girl-like girls were eventually accidentally transferred by a wormhole to The 8th world, making them the first group of human beings in 8th world.
anime-girl-like girls are much more goodlooking and childlike than most human beings, but are very similar to each other, and are non-aggressive, and many of them are also childlike in personality.(Note 1) Due to their cute and childlike looking, and their non-aggressiveness, they are seemingly defenseless and are easy target of bullying, but it is known at least some of them know how to protect themselves, also those who can defense themselves also help others to defense.
Most anime-girl-like girls are asexual or homoromantic(rather than homosexual, as almost no anime-girl-like girls have interest to have sex with either males or males); and it is thought that some(more than human average) anime-girl-like girls, especially those who have a more mature body(the face of all the girls are somewhat childlike), may have ADHD and/or Autism Spectrum Disorder(Note 2).
Anime-girl-like girls have their own language and culture, their language is called Toka na Musume, which is heavily influenced by Japanese but has a different grammatical structure and basic words from Japanese, their culture is also heavily japanese-influenced, especially being influenced by Japanese Animes, Japanese Mangas and otaku culture, it is thought that the culture and language influence is somewhat due to a Japanese otaku girl named Rino(梨乃)(Note 3) who likes cute girls(and has no interest to males) and is from our world.
Almost every anime-girl-like girl has a hairstyle with bangs covering their foreheads and brows, and most of the anime-girl-like girls have long straight hairs, and they may tie their hairs into ponytails, twintails or braids.
It is said that mermaids do exist and are a subtype of anime-girl-like girls.
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Notes:
1. while normal human beings like you and me can become aggressive in certain environments, for example, facing a large sum of wealth, holding a true power("power corrupts absolute power corrupts absolutely", also, wealth is a form of power and is the major form of power) or being in an army where everyone is taught to kill the enemy, like the American Army in the Vietnam War("By the time of the United States involvement in the Vietnam War, says Grossman, 90% of U.S. soldiers would fire their weapons at other people." - Wikipedia on killology)
2. always fall on the range of Asperger Syndrome or High-Functional Autism, as all anime-girl-like girls have an above average intelligence
3. neverthless, Rino is very good-looking and her gene has been added to the gene pool of anime-girl-like girls, thus, many anime-girl-like girls also have her genes.