Koi Fish Tattoo Ideas and Templates In general, Koi fish tattoo designs are considered to be one of the most popular and beautiful among tattoo designs, which are attributed to their large size, adorned with vibrant colors and exquisite shading. . Koi is the Japanese name for carp, a common edible fish, which is also recognized as a playful pet as well. Koi is a beautiful fish, which is endowed with vibrant colors and amazing patterns, for l