Basically in the song you first fight the lil guy you see on the images in a wooden ship(because, pirates) but then halfway in, a mermaid(the one you see in the image) sings in and lures the lil man and some other characters that were in the ship into the sea she was in, she then throws a rock at bf and gf's head and takes them down too.

While she's eating the drowned corpses of the landlubbers(in a cartoonish way, of course) bf and gf decide to just rap with her underwater because they have plot armor. At the very end of the song she just uses another rock to knock them down and they die, lol.

Now i wanna talk about the mermaid character, i don't have a name for her yet but the main thing 'bout her is that she's the daughter of a strong and powerful man, she is popular in the town she lives in, and also is considered to have a beautiful voice by many. But in a fateful day, in the town she lived in, some thiefs capture most citizens including her, they then offer a deal with her. The thief gang had personal grudges with her father, as he had great influence over a main commercial river, however he didn't allow access to the fishing trade made by the thiefs, as himself says he doesn't trust them. They said that if she killed her father, they would set all of the citizens free. She was a young and naive woman, and so she was panicking and didn't knew what do to, alot of thoughts went over her head. But, she decides to kill her father. The next night, she invades his house, and when she gets to his room, she proceeds to use a sharp steel dagger and stab her dad's throat and chest multiple times. He died very quickly. After that incident, her action was frowned upon by many of the townspeople. As killing your parent was a considered a cardinal sin. At some point, a deity(can be anything, really, but it was a deity) becomes aware of what she did, and they then make a curse upon her, turning her into fish folk. They made so she could only move in water and only live in water, and also stitch her legs together and deform the feet to resemble fish fins. They've also made her being able to not die to natural causes, more specifically, age. The events of the main song takes a few centuries after the curse which explains why she looks like that in the image.

The other guy which I also don't have a name for, doesn't really have anything interesting yet, but I'm planning on adding something cool.

It sounds abit grim and gloomy, but idk i thought it was le original and cool, what y'all think of that heckin' idea