This list of mythical creatures that begin with this letter and I am constantly gathering information from each continent, and is continually being updated.
Marid (Arabian mythology)
In Arabic folklore, a Marid is a djinn associated with open waters of the Seas and Oceans where it finds sanctuary. Marids are mentioned in the Qur'an. And to guard against every rebellious (Marid) devil.), as well as pre-Islamic Arabian mythology and throughout Asia.
Marids are often described as the most powerful type of djinn, having especially great powers. They are the most arrogant and proud as well. Like every djinn, they have free will yet could be compelled to perform chores. They also have the ability to grant wishes to mortals, but that usually requires battle, imprisonment, rituals, or just a great deal of flattery.