Yamamoto

Low-energy.
Expressionless.
Despite her looks, has fantastic grades.
Thinks like a normal person.
Actually has a part-time job.
Puts a lot of effort in but tries to hide it.
Hates annoying things but hangs out with Wada anyway.
Kind of good at looking after people.
Loves kids.
Usually somewhat careless.
Doesn't care about the internet, ignores social media.
Names of celebrities and other people go in one ear and out the other (has absolutely zero interest).