Firstly Nightmare, had to be careful with Killer at first due to his more problematic issues.
So Killer is aloud to go through and cause the most destruction in AU's aside from usually from Frisk, Chara, Undyne and sometimes Alphys.
Or again, Nightmare, recruited an alternate version that's more Psychotic, or more controlled by a hate filled Chara, With Killers determination, Nightmare usually has to make Nightmare snap back into attention, usually with physical abuse, (or flirting if ya like Killer x Nightmare)
And Nightmare has to usually have prisoners on site in the castle for Killer, to kill when his determination for killing gets out of hand when not on a mission.
These, are my Killer Head Canons hope you enjoyed them!
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Undertale, and it's AU Headcanons
FanfictionThis, will not have a regular upload schedule, and will just be as the name suggest my own head canons, for the characters.
