Boy X

"Boy X" is a character in Battle in 5 Seconds After Meeting series. He is a member of the Third Observer's team during the Fourth Program.

Personality
Despite his innocent appearance, he is extremely cruel and sadistic, killing people indiscriminately without remorse and even keeping a constant smile on his face while doing so, showing that he has no regard for anyone.

Plot
During the first day of the Fourth Program, he killed all the other ten members of his observer's team.

On the sixth day, he approached Ringo Tatara who was incognito in a cafe and attacked her with explosions in the middle of the street, forcing her to hide in a club, where he manages to incapacitate her until the intervention of Koji Kitajima. Despite getting past Koji's kapoeira and ability nullification by throwing debris caused by his explosions, he is bested by a combination of Koji and Ringo. However, he catches Ringo in an explosion, apparently killing her and giving him time to get out of the place.

Lord of the Flies

 * Description: The ability to turn something of value into a bomb.
 * He is able to turn something that has some monetary value into an explosive.
 * The firepower of the bomb depends on the value of the object. The higher the value, the greater the explosion.
 * The "value" is determined by the user's understanding. A 10 yen coin will always have a universal value of "10 yen". A bottle of water that you buy for 1.60 yen has a value of "1.60 yen".
 * This ability does not work with things whose exact value is unknown to the user.
 * After gaining several kills in the Fourth Program, he can create land mines when an object becomes worthless (when a cup of coffee spills and becomes worthless, it explodes).