The Weeper

An unnamed man, nicknamed "the Weeper" by Amunet Black, designated as Subject 4 by Clifford and Marlize DeVoe is a meta-human with the ability to secrete a psycho-active drug through his tears.

Biography
On October 10, 2017, this man had been riding a bus crying to himself. Ralph Dibny had been next to him and tried to cheer him up with some encouragment as he had been bumming him out. Then the bus was exposed to dark matter particles resulting from Barry Allen's return from the Speed Force, transforming him into a meta-human.

Sometime over the next three weeks, the man was found and kidnapped by Amunet Black, who intended to sell his psycho-active tears for profit.

He was eventually saved by Iris West, Felicity Smoak, Cecille Horton, and Killer Frost, however, he told them to leave him alone and he ran off in a panic.

Later, while walking the streets alone, he was found by Clifford DeVoe, who told him that he went through a lot of trouble to create him and that he couldn't run away until he completed the task he was created for.

It is revealed the DeVoe syphoned off his tears to a more concentrated form to better control his wife Marlize; leaving the Weeper's fate unknown. Using them in conjunction with the telepathic abilities of Dominic Lanse, DeVoe can actually alter one's memories.

Given that DeVoe had mentioned that there were still two bus-metas left to find (who Harrison Wells had determined were Janet Petty and Edwin Gauss) and his wife corrected him, saying that the Weeper was still at large, leading DeVoe to awkwardly acknowledge his mistake, it's possible that DeVoe stole the Weeper's powers without Marlize knowing. This is further supported by the fact that DeVoe regularly drugs her with this meta's tears.

Powers

 * Meta-human physiology: After the man was struck by the dark matter energy after the Flash was released from the Speed Force, this altered his DNA and cells, enabling him to access his newfound powers.
 * Psycho-active tears: The dark matter in his body causes his tears to secrete a substance that acts like a psycho-active drug when ingested.

The Flash
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Season 4
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Trivia

 * Like every meta-human created from when Barry escaped the Speed-Force, releasing a wave of darkmatter upon the bus that the Weeper and eleven others were riding on, it would seem that the Weeper's powers were a forced manifestation of his inner desires and/or inherent nature as a person prior to the encounter with the darkmatter. In this case, the Weeper was presumably in tears for being such an unwanted individual; now, his tears' potent euphoric properties would make him a very wanted individual.

Behind the scenes

 * In the DC comics The Weeper is a legacy name of two supervillains. Original Weeper Mortimer Gloom was a villain of Bulletman, while his unnamed son succeeded him as a villain of Marvel Family after his death.