A personal arc, huh? I always love them. 

For Yuniko, I think that actually shattering the illusion she has of 'magical girls fight for justice!' and that she is doing the same while being a magical girl will give her a rather big shock when she realizes the truth.

This will make her stop drawing all together and get really depressive. Just so you know, if no one helps her, she'll probably end up a witch herself while swallowing in despair. 

As for Vic, I still have no concreted(fucking) idea.