The line is based on young, child monkeys becoming different types of Japanese delinquent stereotypes that have been influenced by Western ideas.

Pansage/Simisage = bousouzoku
>known for their loud motorcycle gangs
>like to stand out with fashion and vehicles
>biker fashion, and large, outrageous pompadour hair

Pansear/Simisear = yankii
>known for trying to be cool
>adolescent counterpart to bousouzoku
>short variants of regent hair, and unique eye/face gestures

Panpour/Simipour = kogal
>known for materialism and frivolous spending
>independent, rebellious high schooler girls
>altered schoolgirl fashion, and long, curled hair