After some research, I found a few possible references:
Assuming you're looking for a general paper on Shino Izumi, here's a starting point: shino izumi
"Shino Izumi has a resting face that could curdle milk, but don't let that fool you. She is the friend who will drive two hours at 2 AM to pick you up from the airport. She communicates through actions, not words. If she makes you tea, she loves you. If she makes you tea and gives you a cookie, she would take a bullet for you." After some research, I found a few possible references: