MK1: Sub-Zero Spine Rip
MK2: Reptile Head Eat/Shang Tsung Soul Steal
MK3: Reptile Acid Shower/Sektor Trash Compactor/Cyrax Helicopter Spin
MK4: Reptile Face Eat
MKDA: Reptile Acid Shower/Cyrax Internal Grinder
MKD: Sub-Zero Head Toss/Scorpion Spear nd Neck Snap/ Baraka Mutilation
MKSM: Kung Lao Buzzaw/Liu Kang Bonebreak Combo

Guess it's not hard to tell who my favorite character is lmao

MK1: Raiden's Head Explosion
MK2: Cage's Torso Rip
MK3: Cyrax's Helichopper, both of Nightwolf's
MK4: Quan Chi's Leg Beat
MKDA: Cyrax's Meat Grinder
MKD: Darrius' Arm Rip
MKSM: Buzz Saw

MK1: Sonya's Ember Kiss
MK2: Mileena's Stab / Kitana's Decapitate
MK3: Sonya's Purple Kiss / Sindel's Scream
MK4: Sonya's Leg Split / Tanya's Neck Twister
MKDA: Can't think of any that I liked all that much
MKD: Mileena's Sai Kick

MK1: Sub-Zero's Spine Rip
MK2: Scorpion's Toasty
MK3/UMK3/MKT: Both of Stryker's
MK4: Reiko's Thrust Kick
MKDA: Hsu Hao's Laser (or whatever it is)
MKD: Kabal's Baseball Swing

MK1: Spine Rip (Sub-Zero)
MK2: Vertical Hat Slice (Kung Lao)
MK3: Soul Steal (Shang Tsung)
MK4: Hand Clap (Shinnok)
MKDA: Soul Steal (Shang Tsung)
MKD: Head Pierce (Baraka)

MK1: Sub-Zero Spine Rip
MK2: Kung Lao Hat Slice and Johnny Cage Torso Rip
MK3: Nightwolf Heavenly Light
MK4: Quan Chi Leg Rip
MKDA: Frost Ice Kick
MKD: Both of Sub-Zero's fatalities
MKA: erm....
MK vs. DCU: Batman's Grapple Hook