Cosmo is Jotaro Kujo, the grandson of Joseph Joestar, A famous retailer. Jotaro is a high school student who lives in Tokyo, Japan.
Cosmo first found about his ability when he was 18 year old. when he found out he has the power to control something unbelievably powerful he needed to figure out how it works. his power work is that he summons it through his mental power.
Cosmo's partner the world has the power of a rhino with the ability to stop time for 10 seconds, but if he doesn't leave the time zone he will forever be there. he can only summon him from a meter away