Your average Joe and Jane. They range from simple to ambitious. The human species is remarkably resilient and capable of great feats if they put their minds to a task. Over the last two millennia in the Liminal Chronicles verse, they have emerged from several feudal class and caste systems to independence in many areas and have become capable of launching ships and satellites into outer space. They've evolved to an extent in size, lifespan, and intelligence, due to better nutrition and education over the ages. In the main country of the setting, belief remains in the Shinto Kami, but Buddhism arriving from India through China is also rooted strong in the culture. These beliefs seem to have meshed well together. Then they incorporated first with magic then modern living, where everything is seen to have a spirit and tech is best when it is in harmony and balance with nature. Though belief has seemed to wane in the modern age.
Genetics and Reproduction
The birthrate tends to out pace that of most other sentient races. Most species from the Spirit Realm can marry and have offspring with humans. Humans usually seem to have no concern over marrying a being of another race. The children are considered human, but often have extraordinary powers (such as strength and wisdom) and a keen ability for magic. It should be noted that unless there is love in a human/non-human match it can cause illnesses such as Kitsune Sickness.
Growth Rate & Stages
Maturity of the species varies culturally by location and time period. In modern Japan adulthood is considered to be 20, where there is a yearly 'Coming of Age' ceremony.
Civilization and Culture
Interspecies Relations and Assumptions
Good for the most part. When trust is established on the human side, it usually lasts. Though many of the races originally from the spirit realm have had to hide their presence because of the human population explosion and humanity often destroys what it does not understand. In the last few decades, the decrease in Japan's population has made things easier for the other races to hide and fill in gaps in small towns. There hasn't been an inter-species war since about the year 1000--the days of Watanabe no Tsuna and his cohort who exterminated the major Oni horde.