Junkrat

Junkrat is the alias of Jamison Fawkes, a character who first appeared in the 2016 video game Overwatch, a Blizzard Entertainment–developed first-person hero shooter, and the resulting franchise. A denizen of a radioactive Australia, Junkrat is insane and obsessed with explosives. After finding a valuable secret, he becomes a target for various groups and forms a partnership with the character Roadhog. The two engage on a crime spree, though come into conflict with the city Junkertown and its ruler, Junker Queen. Junkrat was well received upon debut, seen as a humorous madman character in the vein of those such as comic book villains the Joker or the Green Goblin. His gameplay has received similar praise, particularly for how well critics feel its suits his overall personality. Junkrat has been seen as a positive example of disability representation in video games due to his prosthetic limbs, though at the same time has received some criticism for Blizzard's portrayal of cultures through him and a perceived reliance on stereotypes.

Since this is a au I came up with he's a merman ^^