Digimon Adventure – The Digidestined are traumatized by Doom Slayer glory killing Myostismon. Not helped by the vampire digimon screams of agony. If they were to face off against the Dark Masters. Doom Slayer’s murdering of MetalSeadramon, Puppetmon and many minions will desensitize them to not feel anything when they watch MetalEtemon have his limbs somehow twisted before being seeing the monkey blown up by the BFG, Machinedramon begging the Digidestined to be put out of his misery, and unspeakably horrible things happening to Piedmon. That is if Doom Slayer is too busy ripping and tearing the Dark Masters minions apart
My Hero Academia – If the Doom Slayer decides to perform his rip and tear shtick on the villains, many woukd panic. Doom Slayer would most likely be able to slaughter characters like Himiko Toga, Hero Killer Stain, the many Noumu, Overhaul, and even All for One. Imagine what it would be like if you were a villain, the Hero Killer was easily killed, and his killer is coming for you now. That would make characters like Dabi, Toga, and many others break down.
Pokemon – Doom Slayer would probably kill many villains like Faba, Giovanni, Ghetsis, Cyrus, and Hunter J, stealing their pokemon and indoctrinating them to want to rip and tear demons. Imagine if the Doom Slayer raised an army of Pokemon that wanted to Rip and Tear demons like he did.
What kind of consequences do you see if we put the Doom Slayer in another world of your choice?