"For the perishable must be clothed with the imperishable, and the mortal with immortality."
― 1 Corinthians 15:53
"I’m only gonna say this once so listen carefully, Trafalgar D. Water Law. Perform the Perpetual Youth Surgery which is the ultimate Op-Op technique on me and…die! In exchange, I’ll grant your wish, whatever it is."
Zed (Code:Breaker) using his Death ability to materialize life and retrieve it, and immortalizing anyone who has their "life" extracted via this manner.
Shenron (Dragon Ball) can grant immortality to one who wishes it. Only Garlic Jr. succeeds in making the wish, as all others who tried are impeded by various circumstances.
Utsuro (Gintama) granted Oboro immortality by giving him immortal-enriched blood, allowing the child to survive even fatal wounds, though in the long terms Oboro's mortal flesh is breaking down from the blood's power, and its immortal attributes is only prolonging his suffering.