The Blood Brothers, also known as the "Blood Brothers and Sisters", were zombie-like beings that were created by Dr. Ramsey Rosso/Bloodwork.
The blood brothers' intentions are the same as Bloodwork's, as he controls them.
The first blood brother to come into existence was Mitch Romero after he attempted to attack Ramsey Rosso during a business deal that goes bad. Rosso attacks him with is new meta abilities, killing him in the process.
Shortly after Romero was defeated by Team Flash, Ramsey took some of the black blood for study and realized that if he absorbs it, he can make himself stronger.
He later attacked a hospital in order to start his quest for eternal life and created a few more to help escape.
After a drop of Ramsey's blood enters Barry Allen's system, Ramsey turns him into a blood brother by tempting him with a hallucination fuelled by his own fears and insecurities.
With Dark Flash under his control, Ramsey started changing anyone he could find into blood brothers. Eventually, he tried to turn everyone in the city at once using the particle accelerator, but he was stopped by Allegra Garcia, and all the blood brothers returned to normal.
- Ramsey Rosso/Bloodwork (deceased)
- Mitch Romero (deceased)
- Various doctors and patients from Central City Hospital (deceased)
- Various Central City residents (cured)
- Barry Allen/Dark Flash
- Team Flash (inactive)
- Harrison Nash Wells (deceased)
- Allegra Garcia (deceased)
- Kamilla Hwang (deceased)