Bōsōzoku literally translated from japanese as "violent running tribe"
Bosozoku are the Japanese biker gangs. The bosozoku whore the closes resembling those of a kamikaze pilot, and had handmade (embroidered ) writing with the name, logo and creed from the gang. I combined the idea of 2 rival octopus bosozoku gangs, one is white and the other one black.
I chose the octopus because most of the species live in coral reefs ( if you can imagine that the modules of a reef are buildings, they would be a huge city like Tokyo. Also the coral reefs are crowded with different species of underwater animals just like Tokyo is crowded with different types of people: businessman, lawyers, store owners, market-men, young children and so on ).
Another reason for choosing the octopus is that bosozokus and the oct. are very much alike: they are extremely defensive if attacked, the bosozoku are bike riders ( traveling at high speeds ) the octopus have means of fast travel that is called jet propulsion, the coloring of an octopus is vast ( some types even change color, like a gang member leaving and joining another group )