Rei Hoshimiya

A girl with an iris able to see probability, she appears in chapter 28 where she is looking for her pendant which she has lost, she sees Toru with 100% chance of finding it on top of his head and asks him for his help saying he is her only hope of finding it. She doesn't have aversion towards iris zeroes and is even impressed at Toru for figuring out that she was looking for something just by looking at her even though he has no iris