Maid of Void. When you always suddenly discover them around in the most convenient/inconvenient moment at the most right/wrong place to be. They just shrug. "Idk, man. I was hanging around there when yall suddenly came and then shit escalated." or "I didn't came when needed, I was there. How did you miss that I was. Ridiculous." And you can't even say whether are they lying or not. Both are equaly likely to be a case.

Being irrelevant can be a burden, but when you know to exploit your own irrelevance? Then things start to get spicy.