Animosity to Lunatic (Start): "A Cheap Imitation"
Idk if theres a kill line

animosity to vixen (start):the brighter the fire. end: i forgor it

bonehead (start): smiley trashbag. end: time to join your brother

there is one with royalty but i forgot it

Flower (start) Asriel? (end) Coward.

royalty start: i've killed you a thousand times, a thousand more wouldnt hurt... Royalty end:another kill to the list. (might be different kill line for toriel but probably not)

cowboy start:'you cannot bring justice.' cowboy end:'just like him'

ninja start:'running cannot save you' ninja end:'all that speed and yet you still get cut down'

wrath start: a mindless brute end: i forgor

great job @gr1mm

Psycho:
Start: A corrupted mind.
End: I've killed more.

Originally posted by LmmalachiTTV:

Animosity to Lunatic (Start): "A Cheap Imitation"
Idk if theres a kill line

there is a kill line, its "My LV is stronger."

Originally posted by Goku:

wrath start: a mindless brute end: i forgor

the kill line for wrath is "Your legend ends here."

Here is all the ones I've found so far

Cowboy start: "You cannot bring justice.."
Cowboy end: "Just like him."

Ninja start: "Running cannot save you."
Ninja end: "All that speed and yet you still get cut down."

Wizard start: "Spells weak as theirs."
Wizard end: "And not even worth LV"

Robot start: "Please don't dance."
Robot end: "Just as brittle."

(Surprisingly nothing mutant)

Bonehead start: "Smiley trashbag."
Bonehead end: "Time to join your brother."

(Nothing with Numbskull except a special animation and dialouge from him saying: "Why hello human! It appears you have one very large knife.")

Royalty start: "I've killed you a thousand times, a thousand more wouldnt hurt..."
Royalty end: "Another kill to the list."

Flower start: "Asriel?"
Flower end: "Coward."

Lunatic start: "A Cheap Imitation."
Lunatic end: "My LV is stronger."
(Weirdly capitlized)

Animosity start: "A useless copy."
Animosity end: "There can only be one."

Wrath start: "A mindless brute."
Wrath end: "Your legend ends here."

Fallen start: "A wingless angel?"
Fallen end: "You've fallen from your grace."

Vixen start: "The brighter the flame."
Vixen end: "The faster it fades."

Goren start: "A tainted soul."
Goren end: "Well earned experience."

Shin Goren start: "A corrupted soul."
Shin Goren end: "Rest easy... warrior."

Elder start: "Time dulls the senses."
Elder end: "And so, it claims all."

Moonwalker start: "I met someone like you."
Moonwalker end: "Now he's an orphan."

These are all I can find for now I'll let you know if I find more