Dishonored things I would still spend money on at this point if they existed:
1) more pop figures. Billie, Daud, Delilah (I'm still seriously shocked they didn't make one of her) etc.
2) A dlc where you play as Delilah and the witches. You kill people with plants, have tea parties, and the game focuses on Delilah's bitter childishness, and her relationship with the witches and working against the abbey/Empire. You are given a legitimately good reason as to why Delilah Copperspoon would be a better Empress and why she should have the throne, making you question the outcome of the second game.
3) a game where you play as Granny Rags and your morals and points of view change throughout the game and by the end you end up doing terrible things, but the game makes you believe you're doing good. Also making bone charms out of people. Good shit™
4) comics. But not with some weird action thing like they try to do and fail at. stories about basic everyday for the main characters. Small snippets of their lives.
Some ideas for such:
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A) following the Outsider before he became god. You get a view of what the world was like 4000 years ago. You get to see what he was actually like. Good way of making your readers feel even worse for the whale god.
B) a look at Emily's early childhood and Corvo's relationship with both her and Jessamine. Learning if Emily knew he was her father all along, or if it came out at some point after the events of the first game. You also get a look at whether Corvo and Jessamine were somewhat open about their relationship or completely secret.
C) the beginning of Jessamine and Corvo forming a relationship. She was significantly younger than him when he became royal protector. It would be interesting to see how they went from tolerating each other, to actually liking each other and forming a relationship from it. The awkward beginning when they're trying to figure everything out. (Side note: Corvo's reaction to Emily being a thing would be amazing to see)
D) Delilah and Jessamine's relationship as children. How that was like and how they treated Delilah with her being an illegitimate child. Also following how Delilah's life went after she was kicked from the tower. Her mother dying, etc. How she became as power hungry and vengeful as she did.
E) Daud's childhood. What happened to him and how he was moved to follow the steps he did to become what he did. It would be interesting to learn of his mother, and his early years. Who took him. Exactly what that did to him.
F) Billie's childhood. How she met Daud, seeing that play out. Seeing her with her girlfriend, just how losing the closest person to her changed her. Seeing Daud and her's relationship change and him become closer to that of a father figure to her.
G) historical events/lore. Anything around that. Following deeper into old gods, the abbey, etc.
H) shorts with some side characters that had little role in the franchise but fan favorites. Thomas, Calista, etc.
I) the lonely rat boy. The creation of the plague.. why the Outsider marked a child. The playout of how that all came about.
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5) a hard cover copy of a fully scribed play of either, The Young Prince Of Tyvia, The Daughter Of Tyvia, or The Heart Of The Abyss. Actually all. I want all.