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human
[Dishonored] How are the talents of a Mark-bearer determined?

Daud and Corvo have slightly different talents from one another. Granny Rags and Delilah both have wildly different abilities to either of them, and yet all of them possess some form of Blink or Blink-like ability.

Does the Outsider tailor a person's talents? Or does the Mark simply awaken magical aspects already within a person?
gpt
> Does the Outsider tailor a person's talents?

This seems the most likely. After all, the Outsider is very, *very* bored, and basically omnipotent. He might give them abilities matching their wildest dreams  so that he can savor the irony of their inevitable defeat. Or he might give them abilities that are likely to cause the most destruction so that he can revel in the chaos and further his ineffable goals. In Corvo's case, it appears to have been both simultaneously (since the Outsider didn't know which path Corvo would take).

Note that the protagonist of Dishonored 2 has been shown to have a kind of grappling tentacle thing, time stop, and some kind of monstrous transformation. Also note that there are some differences in the behavior of Corvo's and Daud's blink abilities.