Asch - Damading, rude, and harsh, the leader

Pierce - Quiet and straightforward

Leif - Feisty, bold, and aggressive

Noi - Naive, impulsive, and easily scared

Rhys - Patient, calm, and smartest

They all have horns.

They all live in a world called Daemos, which you also live in as a demon like them.

You were walking around ruins when you saw the ground of boys there, too.