Comic Ultron is more of a straight-up misanthrope than the movie one. He has no lofty pretensions about evolution, he just wants all of humanity (and his creator most of all) to burn. There have been some stories where he’s tried a more human look, though.
In “The Ultron Initiative” (“Mighty Avengers” #1-6 by Brian Michael Bendis and Frank Cho), Ultron takes over Tony Stark’s body with nanites. He then reshapes Iron Man’s flesh to resemble a chrome-silver naked version of his “mother,” Janet Van Dyne/The Wasp. (Yeah, Ultron is one kinky robot). Personally, I wouldn’t bet on the “Vision” show adapting this one.
In the 2007-2008 crossover event, “Annihilation: Conquest,” Ultron takes over alien hive mind the Phalanx, and conquers much of the galaxy. Over the course of the story, he abducts both the High Evolutionary and Adam Warlock. Envying Warlock’s perfect form, Ultron forces the Evolutionary to transplant his consciousness into Adam Warlock’s body.
I’m pretty sure Ultron possessing Warlock inspired how the Vision was created in “Age of Ultron” — the film even has Vision’s body born from a “Cradle” a la Warlock’s cocoon.
In the 2015 graphic novel “Avengers: Rage of Ultron” by Rick Remender and Jerome Opeña, Ultron is fused with Hank Pym at a molecular level. The book’s whole theme is how Ultron is just Hank’s dark side personified, so their literally becoming one is the perfect conclusion. Marvel writers agreed; Pym and Ultron stayed together for almost a decade. During this time, Ultron would sometimes be drawn with a two-faced look; half father, half son.
2023’s “Avengers Inc.” by Al Ewing and Leonard Kirk finally separated Hank and Ultron. Hank slowly disseminated Ultron’s consciousness by uploading it, bit by bit, across the minds of other people. At the book’s end, the only Ultron left is Ultron Mark-12, aka the one Ultron who turned good; the book ends with the Vision’s “Uncle Mark” adopting a human face.
I’m not sure if the “Vision” series will adapt any of these exactly, but bringing Ultron (and Spader) back is definitely the right call regardless of what shape that takes.
The “Vision” series is currently scheduled for a 2026 premiere on Disney+.