Marrina Smallwood

Courtesy of Wikipedia:

Thanks to her genetic structure that was a hybrid combination of Plodex and Earth DNA, Marrina was totally amphibious, and had pale yellow skin, large fish-like eyes, and webbed hands and feet. Possessing both lungs and gills, she could breathe and exist indefinitely on land or under the sea. She could withstand any freezing temperatures without harm. Her hydrodynamic proportions, sleek skin, webbed extremities, and superhuman strength aided in her swimming. She could accelerate herself through the water for short periods far faster than any known human-sized organism by shedding outer layers of her skin, exposing a nearly frictionless inner skin layer. She could survive in the ocean depths or on land indefinitely, and breathe in both environments. In order to survive the crushing depths of the ocean, her physiology was specially enhanced. Her strength, endurance, vision, and stamina were all heightened beyond levels attainable by humans.
To travel, she could swim with considerable speed underwater, and also create massive waterspouts to propel herself into the air that stretch several kilometers inland and can also be made to strike a target with considerable force. On dry land, she could run at tremendous speeds. She could also brace her body to withstand the full impact of a semi truck, completely stopping the vehicle dead in its tracks, while completely remaining unharmed herself.
Although Marrina had a friendly personality, thanks to her upbringing by her foster parents, her mental programming by the Plodex with a savage lust for conquest repeatedly emerged from her subconscious mind. Her savage instincts could be triggered by chemical stimuli given off by other Plodex. When Marrina became enraged and her Plodex DNA took over, she would take on a more beast-like appearance. Her hands would turn into talons that easily cut through most material, and her skin secreted an oil which worked like a contact poison and could cause extreme constriction of the pupils of a member of another species, blinding him or her temporarily. Marrina could change shape to an unknown degree under the influence of her savage instincts. During her pregnancy she grew to gigantic size as the Leviathan. In this form, Marrina resembled a sea serpent and was over a mile in length.

Made starting from a base figure of Preiser 1:22,5, with changes in White Magic Sculp and colored with Citadel colors and washes, hope you like her: