Thank you, I'm glad someone could find some enjoyment in my first attempt! I did not know of the existence of that channel, I'm just a person that is mildly interested in the figure lol.
I can see the ranks being too high, in my mind I wanted to compensate for the lackluster Parameters, but in hindsight yeah they were a bit too high.
Especially Tools, I wanted to make it a bit higher to ensure that his attacks could actually harm other Servants, as regular gas would at worst mildly inconvenience them.
I do agree that UE is a somewhat weird skill and it's not something that would really be "unique" to him, but it was the best way I could find to explain how their identity could never be found even in a world with Magecraft, after all if they could find Jack The Ripper, a case like The Mad Gasser would most likely be easier to solve.
The idea was to leave the mistery open, are they real in this world or are they just a case of Mass Hysteria?
For the NP my reasoning behind both the teleporting and Clones is a way to mirror how their supposed activity was, they could strike at any moment and I really liked the visuals of their opponents slowly moving through the city while being hunted by these masked maniacs. Teleporting is probably too good a feat for them, though, I agree. I envisioned them as popping up in random places, filling the streets with their copies and creating mass panic, teleporting would be the one way for the Mad Gasser to not fight the other Servants unless cornered, for they would most likely lose in a fair duel or when being jumped on.
That said, thank you so much for taking the time to read it, I really do appreciate it