Coming back from the dead is common place for every single person on Earth.
Downplayed: Emperor Evulz is back from the dead, but his minions had to spend years searching for that legendary artifact needed to do so. Alice, now a Retired Badass, has to come out of retirement to take down Evulz again., hopefully for good this time, so her children don't have to deal with this years later.
The Empire has resurrection technology, and they can't wait to employ it on their leader.
Bob: Does anyone actually die in this series, or what? Carl: Only if they're mooks.
Invoked: The Empire begins researching resurrection technology.
Exploited: Since death is no more than a mild inconvenience, no one really needs to avoid it. Need to blow up an enemy Wave Motion Gun? Suicide bomb it. Got a broken leg that'll take weeks to heal? Kill yourself, and you'll pop out of a cloning tank good as new in a couple days.
Played For Drama: A very popular, very high-powered character in a superhero team is not only used for the Worf Effect, but actually killed by the villain. "How can we ever fight Emperor Evulz without BOB?! And if he can kill BOB, what chance do we have?!" Despite being one of the publishers' biggest hits, he either stays dead for the duration of the Story Arc, or comes back as a Deus ex Machina to finish off the weakened villain during the final battle.