Hidden supernatural abilities:
You who came from the stars | He's an alien with several abilities including stopping time.
Goblin | he is basically immortal with other abilities such as using doors as a means of teletransporting.
Black | he is a grim reaper possessing the body of a detective, so he has several abilities: he can't die and he can also teletransport through doors.
While you were sleeping | he knows when FL is in danger through dreams.
Another Miss Oh | he is living in two different times at the same time, though the future comes through him as dreams.