Netflix's The Umbrella Academy cut one of Allison's biggest moments from the comic books - why? The 1960s prove no fun for any of the Hargreeves siblings, but despite padded cells and clingy cults, it's Allison who gets the worst deal. Forced to suffer the rampant racism of the era, Allison finds a ray of light in Raymond Chestnut, a local activist whom she marries, settling into a happy existence, the likes of which Allison has never previously known. Once her siblings find a way home, however, Allison must leave the deeply confused Raymond behind. It's a heart-wrenching choice, but with Allison's daughter back in the present day, it's also no choice at all.
In the original The Umbrella Academy comic story, however, Allison makes an even more difficult decision during her 1960s adventure. The Temps Aeternalis (known to Netflix viewers as The Commission), capture the biological mother of two Umbrella Academy members shockingly revealed to be twins. With the threat of this woman's safety as blackmail, Carmichael the goldfish forces Allison to take the place of Kennedy's wife in the motorcade, and use her rumor ability to assassinate the president. This obviously becomes a pivotal moment for Allison, who goes against her family in order to protect her family, but the JFK story plays out very differently in live-action.
In The Umbrella Academy season 2, JFK is killed by the mysterious Majestic 12. Allison are her siblings are busy working to stop another apocalypse, with Vanya being probed by suspicious government agents and threatening to explode again, and this keeps Allison far away from the death of John F. Kennedy, marking a major deviation from the comic books.
Allison doesn't kill JFK in Netflix's The Umbrella Academy primarily because of the wider differences between comic book and TV show. Season 2's Hargreeves siblings enter the 1960s by accident, trying to stop the apocalypse, whereas their comic counterparts are there specifically for the assassination. More importantly, Allison occupies a dark mental place in the Dallas comic book, still unable to speak. The Temps promise to cure her condition, and this raises doubt over Allison's motivations for the mission. TV Allison is walking an entirely different path, marrying Raymond, learning to speak gradually with his help, and becoming an advocate for Black rights. These additions to Allison's story replace her assassination of JFK in terms of creating opportunities for character development.
Armed with a hostage and the knowledge that two of the Hargreeves siblings are blood-related, the comic book's Temps carry more ammunition to blackmail Allison into obedience. The TV series takes a drastically altered creative route, pitting The Commission in a battle with The Handler, and giving them no reason whatsoever to want JFK dead (certainly not by Allison's hand). The Netflix series hasn't mentioned any of the siblings' biological mothers either, so to suddenly introduce one as a hostage would feel jarring in a live-action context.
The other major reason for the comic change is Luther. The Temps tell Allison that their prisoner is the mother of Five and Luther, and because of her romantic feelings for the latter, she feels compelled to obey. The Luther and Allison romance is playing a longer game on Netflix, and there's no sign of resolution for the pairing just yet. With Raymond Chestnut on the scene, Allison immediately shifting her affections onto Luther so explicitly would've been a mistake for her character. Since Netflix's The Umbrella Academy clearly isn't ready to pull the trigger on Lallison, one of The Rumor's main reasons for complying with the JFK job vanishes.