"Icky" is the modern term for "squick/squicky," a word used to tag posts about fictional stories that contain plot points and narrative conventions that – while enjoyable to the poster and those likeminded – are widely considered to be a dealbreaker to others.
Fictional characters are not real victims and anyone who uses fiction to prey on others is a predator. The line between fiction and reality is crossed when children get involved, including underaged voice actors, underaged live-action actors, and underaged fans who post in adult-only spaces.
If you stumble upon an instance of CSEM/CSAM, please file a report to the proper authorities.
Otherwise, block the artist and move on.
