Power remains alive in the manga. The story progresses with their presence and their abilities play a significant part in the unfolding events. There's no indication of their demise so far.
Power dies in a climactic and intense moment in the manga. It's the result of a series of events and confrontations that lead to her ultimate sacrifice.
Superman's death in comics is often a result of epic battles or selfless acts. For instance, he might face an opponent whose power is just too overwhelming, or he might give his life to prevent a major catastrophe.
Gwen's death in the comics is often a result of a tragic and complex event. Usually, it involves a confrontation with a powerful villain or a series of unfortunate circumstances.
Well, Loki's comic deaths aren't straightforward. It could be as a result of clashes with other superheroes or from cosmic events that he gets caught up in. The circumstances change from one comic series to another.
The circumstances of Gambit's death in comics are diverse. It could be as a result of a betrayal by a fellow hero, or a self-sacrifice to save others. Different comic series present different scenarios.