Attack on Titan

Your biggest fear

Eren:       Your biggest fear is losing all of the people you love and care about and being left alone in the world.

Armin:   Your biggest fear is becoming too attached to someone and they leave you. That's why you have the tough girl act up and you choose a select few that you beleive will stay to see the real you.

Levi: You biggest fear is not being good enough and not having anyone left that cares about you.