Here is a list of mythical creatures beginning with this letter and I am constantly gathering information from each continent and continually updating.
Akkorokamui (Ainu)
Akkorokamui is a gigantic octopus-like monster from Ainu folklore, similar to the Nordic Kraken, which supposedly lurks in Uchiura Bay in Hokkaido. It is said that its enormous body can reach sizes of up to 120 metres (390 feet) in length. Its name can be translated as "tentacle-holding kamuy."
According to legend, Akkorokamui was once a gigantic spider named Yaushikep who lived in the mountains nearby a village named Rebunge. One day, Yaushikep descended down to Rebunge and caused havoc. Fearing for their lives, the villagers prayed to the gods to save them. Their prayers were answered by the sea god Repun Kamuy, who pulled Yaushikep into Uchiura Bay. It is said that Yaushikep turned into a giant octopus who took over the bay as its god and since then, he has been known by the villagers as At-kor-kamuy or Akkorokamui.