If you were self inserted into Worm with Blank, and you somehow managed to kill the Butcher (assuming you have a Shard), would voices of the Butcher affect you? Would the Butcher's power even find you?
The question I really wanna ask is, with Blank, could you be the Butcher without hearing their voices?
If not, then could you suggest a power that could help with this problem from a CYOA?
My next bet if Blank wouldn't work would be Invictus. Not sure how that's work out tho.
Blank doesn't affect Master Powers.
Most versions of Blank just render you invisible to 'Scan' types or ''Predictive' types of powers. Basically powers that scan/sense you or powers that 'Model' you and your behavior in order to predict you.
Like Simurgh, Dinah, Gallant, Contessa, Regent and Cherish.
It wouldn't affect Simurgh from hitting you with TK, or Regent from triggering your nerves or Gallant from hitting you with a Depresso Beam, but they would all be doing it Blindly.
Powers that rely on communication with your Shard to gain information would be Nerfed as well, if you had a Shard.
Like a lot of Thinker powers, like Coil, Jack Slash and Fairy Queen.
Tattletale would be unaffected for the most part, since the vast majority of the Information Gathering is done through Lisa's biological senses.
It would limit some of the Logic Leaps that are due to a combination of Postcognition and her Shard communicating with other Shards.
But in person, her power would still read you like Hollywood Sherlock Holmes, but it wouldn't reach Super Sherlock Holmes levels of reading.
The Worm CYOA V1 of Blank however is a slightly different beast.
That bullshit is low key reality manipulation.
You would still be completely vulnerable to all Thinker powers, but none of them can ever be used NEGATIVELY against you.
Contessa could ask 'Path to Killing MC' and she would be answered '404 Path Not Found' or it would flat out lie to her and make her think it's possible but the fallout would be unacceptablely catastrophic.
But she COULD ask 'Path to getting MC a Harem/Rich/Long Happy Life' and her power would happily comply.
Jack Slash would basically be slightly off in ALL of his interactions with you, to the point where his every plan and instinct leads him to fucking up like he has really bad luck.
Simurgh would probably just ignore you, or make helping you contribute to some of her plans.
But you personally would be fine.
For some reason though, Coil and Tattletale are excluded from being affected simply due to Fiat.
For the Butcher question however, no.
If your MC has a Shard, Blank will not prevent it from possessing you if you kill the Butcher.
If you don't have a Shard however, you don't even need a Perk to not get possessed.
The Butcher only possesses Parahumans, so it would grab the nearest Parahuman.
You would need something like the Mental Fortress perk to be flat out Immune to Master/Stranger powers.
Invictus would just make you have infinite willpower.
You could resist and fight back Master and Stranger effects like an Anime Protagonist, but you wouldn't be outright immune.
Butcher could still possess you, but you could shut out the voices through Sheer Batman Levels of Willpower.
Invictus would also synergize with having a Green Lantern Ring to the point of not even needing to ever charge it, you would be basically a nuclear reactor of Willpower with Invincible Constructs.