[Mukuro is probably genuinely off putting to most people at first glance. She's sickly pale, and her eyes have no light of life in them. She has a tendency to stare unblinking at people for long periods of time. Threat assessment, as she would call it.

That being said she internally exaggerates these traits in her own mind and has internalized a lot of very negative ideas about herself. If you asked her, she would say that she looks like a walking corpse, and that people are right to be uncomfortable around her. She sees herself as less than human, and only values herself based on how useful she is to others. Especially Junko, who she sees as the only person capable of loving her despite what she is.]