But in Griffin's story, as I understand it, the dark depths cannot be avoided? There is clearly use, manipulation, etc. involved, and, as I understand it, Professor Will plays an important role in this.
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Griffin's story is definitely a little more complicated than most other characters. I wouldn't say it goes super dark, he's not an evil person or anything, but he does have motivations based on resentments that could lead to some morally ambiguous choices on his part.
Nothing that will take consent away from Connor, to be clear! Connor will have agency, and his own choices (so yours as the player) will influence the ones Griffin makes.