As one of DC Comics‘ powerhouses, Supergirl often shows off her true power without upgrades, but becoming a Red Lantern showed a whole new side of her that isn’t touched on as much in recent runs. The different Lantern Corps colors represent the emotional spectrum, with red representing anger and rage. Therefore, the Red Lanterns are often considered a very violent group. It’s a shock that Supergirl would be a part of this violent group, but it turns out she fits in better than fans expected.
