Dan Harmon and Rick and Morty
I have both listed because Harmon and his show's aesthetics are both definite influences, just for different reasons. Almost everybody starting to write a script will come across "Dan Harmon's Story Wheel" during that education. It's great, it helps a lot, zero notes. Rick and Morty is Incredibly smart and wildly dumb at the same time. The show is the next moment in my life, save perhaps the era of Futurama and adult Ren and Stimpy, that a mostly mainstream cartoon managed to utilize the underground adult style in a way that remains exciting 8 seasons later, and with a huge global audience of all ages despite it being a hard R deal... it's just that good. A ton of successful UG titles are parody, this one is Back to the Future on 4 hits of acid.