Jai West is one of Wally West and Linda Park's twin children. He aged rapidly due to his connection to the Speed Force to the point where he is roughly 8 years old physically. He could "temporarily superaccelerate the myofibrillar hypertrophism in his muscular tissue" but has since lost this ability. Jai West was created by Geoff Johns and Howard Porter, first appearing in The Flash (Volume 2) #225. (2005)

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