so far ive found that the ultimate cross mod DOES delete him from reality, but not the other stuff on him, im counting this as a kill

Doomsday Bomb (from utopia mod) deletes Saitama.

gregory from the CTTC TECH mod sends saitama to the abyss

Decimator flood (from flood mod) actualy deletes saitama

The Gods Mod
god punches him and that part disappers

i used a black hole (attach a generator/industrial generator to a decimator) and he survived. I can't even delete him. The only way I can get rid of him is by clearing everything/living or restarting map, so I think it's impossible.

not impossible, you just need the correct tools

The colored black hole things from the CTTC Tech remake can kill him

thank you for adding to this page!

the mutation serums don't kill him, but they dont do good things to him either

saitama from emporer fish can

you can kill him with super extreme heat

sword of cosmos counts as a kill but on the mod version its super hard to kill him without gods mod or unlimited void eraser

use ion cannon to kill him

err how are you using the ion cannon? are you using any mods with it?
just tested the ion cannon right now and, hes alive. he even regenerated all the damage the ion cannon did