Hatsuna
Hatsuna is a magician with a pretty dark origin story—she escaped from some kind of laboratory setting. Her most defining trait is basically immortality through resurrection: she can't be killed by physical damage because she just comes back. The catch is pretty brutal though. She's dependent on pills to stay alive. Stop taking them and she's done for, which means she's trapped in a cycle of needing to keep consuming them or face actual death.
So while she's technically unkillable in the conventional sense, she's far from invincible. It's a weird kind of power that comes with its own prison attached.
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