I also think that’s why Anti plays on all these fears; the longer Jack isn’t in full control of himself, the longer Anti can keep control. tl;dr: Anti isn’t a manifestation of Jack’s fears, he just shows up when Jack’s scared, and tries to scare him more. (2/2) Thank you for listening, I needed to get this out.
Fear can be a powerful mechanism to catch someone in a moment of weakness, Anti can- and has- used this to his ultimate advantage against Jack many times before, and even against us.
I personally still like the idea that Anti is a manifestation of one’s specific fears (no- not just b/c Jack himself has liked that concept as well), but it also makes him a lot more wary and to be careful of. How can you fight against someone who uses your deepest fears against you? It’s very Pennywise-like.