Shuriken Surprise
Stealth Shock - Referencing Snake and the orange box from Metal Gear Solid.
Storm Trooper Party-Pooper - ....because Storm Troopers aren't very Christmassey!
Reference: Star Wars.
Taking a break... - ....though it might not be the best timed one.
Snowman Man
Unconventional Lumberjack - Referencing The Legend of Zelda: Ocarina of Time.
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Ninja-themed Christmas Cards