Rihana

Terrorpin is a monstrous from the second volume of the Teenage Mutant Ninja Turtles Mirage comic series. He would later return in second volume of Tales of the TMNT in the story The Cure. She was last remaining female of the Merpeople, she lived in an undisclosed part of New York sewers, her only companions was and  was the Terrorpin who acted as her protector and makeshift steed, along with her young baby Ocenee.

Teenage Mutant Ninja Turtles, Volume 2
Rhanna had been living the sewers for an unknown amount of time protecting her eggs with the aid of Terrorpin, her first encounter with another living soul occurred when Leonardo who was seeking new refuge for his family, had accidentally invaded Rihana's nest and domainHer people near extinct,the protection of her unborn child became her priority. Leonardo's sudden appearance had represented questions with little time for communication or answers on both sides. Knocked unconscious and embedded into the wall, Leonardo was nearly fed to Rhanna’s gigantic turtle companion, the Terrorpin. He managed to subdue Terrorpin, then discovering Terrorpin’s lair, and an egg within it. Both the Terrorpin and Rhanna were slain in the end, though Rhanna managed to protect the Terrorpin’s egg (TMNT Vol. 2, #4 & 5).

Tales of the TMNT, Volume 2
However it was revealed that Rihana is no ordinary creature herself with as much mystery surrounding her origins as that of her mighty steed. Ancient healing arts, mysticism, magic, are questionable properties surrounding her nature. The Entity in her own right would enigmatically and slowly heal herself. She would also help cure her dear friend,The Terrorpin after the ordeal with the Ninja Turtle leader.She somehow restored the Snapper's left eye which Leo had sliced out in defense. Leaving the system, the ruins and the rubble The Sewage recalled the invader and primitive mark and rendering of an angry Leonardo that had destroyed her home. She left the drawing on a near collapsed of the wreckage.Forever burned in her memory and swimming in her soul is the 'THREAT'.Leonardo threatened to destroy her egg...her unborn had she not halted her approach during their tussle. After all, He was invading HER nest ! But it was, however time to move on.With her beast's dwindled eyesight returned, a new journey North to cleaner, safer ground was upon the duo.The exhaustive trek would lead deeper underground where no human or mutant had ever trekked.A foolish school creatures also sought to make a short meal of Rihana during the journey.But with Terrorpin's help the beasts were fended off. He handled the underwater menaces with the same, swift,indomitable jaws that almost devoured Leonardo's person.When the threat was abated, Rihana and her heavy-footed companion made it to the refuge of the higher caves.Her beautiful baby had hatched, the littlest fish creature known as Baby Ocenee. Giving a tiny amount of hope to the survival of a lost people. The small family headed into the even higher, wooded mountains of the great North. Far away from man.And even Further away from the angry Mutant.Mysteries abound surrounding the origin of the giant Snapper. A Mystery possibly forgotten by the ' Fearless Leader ' of the TMNT. Little does he know that he has not been forgotten.Future confrontations with the Fish-creatures and massive Snapping Turtle may prove potentially hazardous. As now Leonardo is considered a threat and enemy.