The Weeper

An unnamed man, nicknamed The Weeper by Amunet Black, is a meta-human with ability to secrete a psycho-active drug through his tears.

Biography
Riding a bus on October 10, 2017, the man was exposed to dark matter particles resulting from Barry Allen's return from the Speed Force.

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 to leave him alone and he ran off.

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.

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.

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.