Sylbert Rundine

Sylbert Rundine, nicknamed Dwarfstar by Cisco Ramon, is a meta-human with the power to both shrink and enlarge objects and people.

Early life
In 2003, Sylbert Rundine was robbing Mercury Labs when a security guard arrived on the scene. Rundine proceeded to shoot and kill him, with Big Sir being incarcerated for the crime due both him being on the scene and Rundine's then current physique being very similar to his.

Gaining powers
Years later, on October 10 2017, Rundine was one of the 12 individuals on the bus that was exposed to the dark matter unleashed from Barry's exit from the Speed Force Prison. The dark matter combined with the shipment of dwarfstar alloy he had just stolen and gifted him the ability to shrink and enlarge objects and people. For the next two months, he proceeded to use this ability to steal whatever he fancied such as cars, military vehicles, and even a Kord Industries research building by miniaturizing them and adding them to the collection he kept in his living room disguised as simple models.

Powers

 * Meta-human physiology: After Sylbert 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
 * Size alteration: Exposure to dark matter and dwarfstar alloy gave Rundine the ability to alter the size of both animate and inanimate objects by manipulating the space between their atomic bonds, and the dark matter within the target.
 * Shrinking: By removing space, Rundine can shrink things to pocket-size, with the side-effects of Cisco and Ralph's shrinking showing that the process also shrinks the amount of dark matter with their cells, proportionately shrinking the strength of their powers.
 * Enlarging: On the opposite end of the scale, Rundine is also able to replace what he took from an object, restoring them (and in the case of meta-humans, the strength of their powers) to normal size.

Weaknesses

 * B.O.O.T.: The meta-human capture device designed by Cisco is capable of incapacitating him.