Opposites are an alternate reality in Athen's Paradise. They are a threat to our reality, they are typically dangerous and volatile especially of certain people.
Opposites consistently have the opposite color scheme, and the opposite personalities of a character. When coming across your opposite with a direct line of sight, you will have either a strong urge to kill your opposite (So will they) This usually features a strong headache and irrational anger and hatred. There are rare cases that it is completely the opposite of that, you would feel a strong urge of lust and desire for them.

LORE:
Cases that these have been adapted and diverted are with 3 Opposite. 2 of them lust based and 1 kill based psychology. The "true" characters also had their psychology fixed as well so that the strong emotions were fixed.