jack masters was the author of a web series call Poorly Planned Comics, it had somewhat of a cult following. it had a lot of metanarrative and honestly was a really amazing piece of work. however jack struggled heavily with mental health (schizophrenia + adhd) and ended his comic in 2015 with his suicide note/will. its pretty dark so i dont recommend seeking it out if it may trigger you or create harmful thoughts.

in relation to my post, jack was friends with someone who knew andrew hussie and also had delusions that andrew hussie was stealing his ideas for homestuck in some conspiracy. (he had multiple delusions about pieces of media, which is not a surprise considering he had schizophrenia).

and as most of us know toby fox used to be tight with andrew, especially in the early 2010s prior to undertales release. i should clarify that im not saying jack was friends with toby or that they even knew each other, however i think its not unrealistic to think toby would have been in a similar social group that would have been reading Poorly Planned Comics, or at least know of it.

in regards to suzzzzzy/susie, jack had another personality named suzzzzzy. its unclear whether this was an alter or a "tulpa" for lack of another word, but this was a very influential part of jack's psyche that he had a sort of toxic relationship with since she promoted harmful behavior. and, well, she was supposedly described as a pink, violent, tomboy who represents chaos.