I think it's common for any suicidal ideators to have some form of media escapism, and yeah, I've noticed that it's often in the form of things like manga and anime. I think that's because things like anime tend to show a better / easier perspective on reality and life. Or perhaps if it's a darker themed story, maybe they're able to find solace in it through their own personal relations. I.E. people idolizing Guts from Berserk.