Hollow Self

The Hollow Self is a sort of "negative" counterpart of a person.

Information
In order to acquire a Hollow Self, one must have at least entered the Red Hell. As all of the entrances into the Red Hell had been sealed after the Apocalyptic Towers incident, there are not that many Hollow Selves at present.

Those who possess a Hollow Self sometimes blacks out, having no recollection of what is happening during those times, but during that time, their Hollow Self takes control. They generally have a much more different personality - for instance, the Sage Overgoddess's Hollow Self is a violent psychopath, though she does have a heart, deep down. Hollow Selves also usually look different than the regular counterparts.

Because the Hollow Self shares a body with the regular counterpart, harming the one will harm the other as well. Separating them is also fatal to them, as one can't survive without the other. However, should the two (by some miracle, as they generally don't get along) decide to work together, they will attain a greater power than they would have on their own. Put simply, they could potentially be a match for even the Greater Overseer without anyone to help them.

Generally, Hollow Selves have the letters in their names written in reverse - with one exception being Hollow Cibryll Schiffer, whose name is written upside-down instead. However, their names are still pronounced as normal.

Known characters with Hollow Selves

 * Charlie de Bruyn
 * Flora Rosewillow
 * Yleven Cero

Trivia

 * The names having the letters written in reverse is in part inspired by the Bleach video games that does it for Hollow Ichigo.