Mind if I add in some? I might also edit some of yours. Sorry for the major bump. :c
Upon
Movement:
"Lead the flock!"
"What shall I harvest this time?"
"The crows... they hunger..."
"The Harvest Moon rises."
"Searching... reaping..."
"Master... I will find you..."
"None will stand in my way."
"This maze is like... a maze." (Parks & Recreation reference)
Attacking:
"More souls to reap!"
"Hack them to pieces."
"Your blood is healthy for the crops."
"Fresh meat for the crows!"
"All must be executed!"
"Time to harvest!"
Terrify:
"Run!"
"Boo! Hahaha!"
"You're in my realm now!"
"Flee in terror!"
"Scream for me!"
Terrify (Union Jack):
"Gobsmacked!"
Terrify (Bandito):
"Howdy!"
"Bang!"
Terrify (Fiddle Me Timbers):
"Yaarr!"
"Avast!"
Terrify (Pumpkinhead):
"Boo!"
Terrify (Risen):
"Return the slab!"
"I cursed you!"
Drain:
"More souls to collect."
"Must... feed."
"Your soul is mine!"
"Succumb!"
Drain (if successfully killed enemy opponent):
"Exquisite."
"Least you tried running, well, not really."
"That was fun!"
"You belong to me now."
Dark Wind:
"Fetch me their tongue!"
"Heads up!"
"Silence!"
"Screaming won't save you, mortal!"
Crowstorm:
"Behold! The Harbinger has come!"
"Blot out the sky!"
"Claw out their eyes!"
"Fly, my pretties! Fly!"
"Feed, my children!"
Crowstorm (Spectral):
"Time to send shivers down your spine!" (Spooky Scary Skeletons reference)
"ooOOOOOOOooOOOOooo!"
Crowstorm (Union Jack):
"Tally ho!"
"Excelsior!"
Crowstorm (Bandito):
"This place ain't big enough for me and you!"
Crowstorm (Fiddle Me Timbers):
"Yohoho!!"
"Ahoy, mateys!"
Crowstorm (Pumpkinhead):
"Scream!"
"Trick o' Treat!"
"Trick o' Treat, kiddies!"
"Happy Harrowing!"
Crowstorm (Surprise Party):
"Surprise!"
"Happy Birthday!"
"What's up, guys!!"
"Balloons! Balloons everywhere!" (Toy Story meme reference)
Crowstorm (Dark Candy):
"Brace yourself! Winter has come!" (GoT reference)
"Killing in a Winter Wonderland!"
"SNOWSTORM!" (WoW reference to Bonestorm)
Crowstorm (Risen):
"Return the slab!" (Courage the Cowardly Dog reference)
"Suffer my curse" (Courage the Cowardly Dog reference)
"Dududududu dudududu du dududududu!!" (Darude - Sandstorm)
Taunting (He runs his fingers along his scythe menacingly):
"The only thing you have to fear is... me!"
"No matter where you run, the murder will always find you."
"You think you're brave? Let me prove it then."
"They'll scream. They'll cry. Soon everyone will be."
Taunting
:
"Aww, am I scaring you? Good."
Taunting
:
"I'll make sure you'll be the one flying South for the Winter."
Taunting
:
"You're nothing but a walking drought."
"Would Azir like a cracker?"
Taunting
:
"Have you seen my crows, little child?"
Taunting
:
"Fool, I AM terror!"
Taunting
:
"Nice toys. It be a shame if someone were to... break them?"
Taunting
:
"Need a bigger boot for this one."
"I'm the only kind of pesticide that you need to fear."
"A bigger bug means a bigger meal for the crows."
Taunting
:
"I'm the true reaper here. Your services are not needed."
"You may be Death, but even Death is afraid of me."
Taunting
:
"You are nothing but a fever dream, Nocturne."
(Ally) "They're going to need more than therapy to ease their nightmares."
Taunting
:
"Be honest, does your face hurt when you smile?"
"You bore me, clown. Show me a new trick!"
(Ally) "You really know how to make 'a killing.'"
(Ally) "Let's put a smile on their faces!"
Taunting
:
"Can I still make a silent woman scream?"
Taunting
:
"How often do you molt, Swain?"
"Does Swain want a cracker?"
"You may be a general, but all I see is a crippled parrot."
(Ally) "Nice friend you have there, have you seen mine?"
Taunting
:
"The chains... the sickle... you took her."
"Let's see if the dead can still feel fear."
Taunting
:
"It's time to fold your hand, Fate!"
Taunting
:
"You see this scythe? You what it's for, and it has your name on it."
"Ah, ripe for harvesting."
Jokes (He taps the straws off of his sack-head, then either a mouse or a crow comes out):
"If I had a brain... erm... how do you use a brain?"
"Excuse me, I think I got something in my ear."
"Uugh... I hate it when that happens."
"Mmm... huh, so that's what inside my head?"