But OC's can use the canon to enrich their backstrokes, for example. Even create interesting and amusing dynamics :cool
>OC gets inspired by a group of Magical girls or boys battling in the city
>Idolizes them
>Makes their own makeshift outfit after getting powers
 An example but there can be more

Also some users might not be too familiar with certain series and want them to intermingle with other series lore this can help. I'm not asking for dominance but merely a teeny bit of leeway :usa