His nickname among supervillain circles is the Tiger Shark, and a normal person would be scared out of their minds. Named Tig-A-Ur-Aron and an Atlantean Warrior he is NOT your cute Disney mer-person. He's roughly human shaped in form and features- but little beyond that. Like all Atlantians he stands roughly a foot taller then a human when on dry land with pale blue skin with natural colors forming bilaterial patterns on his body, sea-green stripes down his back in his case. Muscular and chiseled, his warrior lifestyle has left scars all over his body. His eyes are mostly black like a shark's, and his teeth most certainly look like they belong in the mouth of a shark and not a person.
In Tiger Shark's mind, the Surface World and Atlantis are at war- the present peaceful relations a sign of corruption in the current Atlantean regime. An all consuming hate for surfacers, he's a genocidal maniac who at the moment just lacks an army. When he gets one he usually uses it to attack a surfacer city as soon as he can.
Since the rise of the Superhero a common "threat" are people nicknamed 'Civilians'. Ordinary men and women who fetishize the superhero, their lifestyle and their costumes. Mostly seen as a harmless joke, their flip side is rarely mentioned. Nicknamed "Hostages", there is a group of people who do the opposite and fetishize the Supervillain. Men and women who seek to be used and abused by the Supervillains of the world with a darker, more dominance and S&M related twist.
The Tiger Shark is an ecoterrorist, he know that there would be humans to join his cause. What he didn't expect was that he's actually very popular among Hostages as well - andaybe he can use that too his advantage.