Ohhh shit I forgot the best one what the hell
MERMAID MELODY PITCHI PITCHI PITCHI PITCH or whateverthefuck
Magical girl mermaids saving the world with godafwul pop music hell fucking yes
(I still know these lyrics by heart)
//EDIT
I also seem to remember some really fucked up shit from the manga about 13 yo girls going like "I wanna find a boyfriend so I can be a mother" what
my god it's all coming back to me
there were some incestious evil sister mermaids too who sang evil pop
//EDIT2
I vaguely remember that Gackt was either an inspiration for the main boy or he was the voice (I press x to doubt he would do it)
//EDIT3
Wait what the fuck I'm pretty sure the main boy was the villain secret mermaid man