You may want to check this link

https://www.hg.org/legal-articles/what-legally-makes-it-child-pornography-38082

The Point is, Since any form of imagery can be consider child porn including
hand drawn, manga or what have you has Causes most role playing web sites to
have rules against even creating a underage character even if you dont use imagery, if you can not advertise then you can not find role play partners, and many sites now forbid you to post a email and monitor any private message system for such activity