Aquaman

In Marvel's 2017 Darth Vader series, the Dark Lord of the Sith channeled his inner Aquaman in order to survive the ocean world on Mon Cala.

In any case, it will be interesting to see if Darth Vader will get the chance to become a dark Aquaman again as his current series continues. As such, Darth Vader very much became a galactic version of DC Comics' Aquaman, albeit a much darker one seeing as how he killed the squid monster after it had served his purposes. Featured in Darth Vader #15 from writer Charles Soule and artist Giuseppe Camuncoli, Vader and the majority of his forces were overwhelmed when the Mon Calamari's King Lee-Char unleashed massive sea creatures who drowned Mon Cala's cities on the surface, sweeping the Imperials into the sea.