Thanatos

These are the two oldest images of death I could find.

Note that the idea of winged death predates Christianity and that Death is shown as being male.

Heracles fighting death for the life of alkestis from a vase painting possibly depicting the scene from Euripides' play about this legend ?

part of a relief from the temple of ephesus thought to depict death note that he has a sword rather than a scythe

 please note the spelling THANATOS

Thanos in Marvel comics is an alien from Titan with an obsession with Death.

No connection with the Titans of Greek Myth !

Thanatos according to Hesiod (Theogony 212)  is the child of Night who is the daughter of Chaos (Theogony 123)