Crossover? Side Characters, Please Advise

A series set across various film and TV worlds, with the occasional flirtation with handsome men, no fixed couples, all relationships are just for show, with no real feelings, laying low and building strength early on, then doing whatever I want later, the System keeps a low profile, and failing a mission comes with no punishment. The main idea is to do whatever I please. The plot differs slightly from the original! Hardships are like springs: the harder they push, the stronger I get! A cannon-fodder character who never existed in the original has arrived. Please show me the ropes!