They are generally the same size as humans.
The Shadow over Innsmouth (1931) - H.P. Lovecraft
These creatures are the result of the union between the Merrow and unAscendant
humans. They are often produced during bizarre rituals that take place in honor of the Great Old
Ones, and can be either male or female. Their degree of aquatic mutation varies greatly from
individual to individual, and often becomes more pronounced with age. The creature depicted
here has retained much of her humanity, although her radiant silver eyes, the dark markings on
her minutely scaled skin, her webbed hands and feet, and gills along her ribs betray her origins.
She is the daughter of one of the notable village elders. Beings such as this have often given rise
to myths about sirens, mermaids, and other oceanic mythological beings as they are often in the
habit of enticing fishermen or other ocean going humans into the water, where they are robbed of
their valuables and eaten.
The closer the generation is to their true Merrow roots, the more comfortable they are in the
ocean, some never coming to the surface for the duration of their long lives. As in my case,
subsequent generations seem to quickly lose their oceanic attributes, yet often maintain some
small reminder of their aquatic heritage, such as webbed toes or translucent skin.