Post 'em even though thankfully it will never happen.
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Stat idea:
+Max health increased to 300 HP.
+Every kill with the knife rewards you with 150 HP.
+Player speed, jump height and attacks are increased with power. Ex: Stab speed increase.
+Natural regeneration with 2 HP per 2 seconds.
+Butter knifing inflict minor freezing upon other players, slowing them down and taking 5 HP.
+Bullet damage received is 20% less effective.
-No cloak of any kind. Only Dead Ringer.
-100% damage taken from fire and energy attacks. Ex: Flamethrower and Cow-mangler 5000.
-30 HP taken from being worn outside on a day themed map.
-80% less effective out in daylight.
-Fire and energy damage slows down HP regeneration and speed by 40%, and marks for death.
-Requires 1 backstab to activate, beforehand they are marked for death.
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I feel this would be a really unfair cosmetic but even then this is all for shigs.
Personally on the idea of this thing being added I feel it wouldn't hurt the art style that much. Of course though I think it shouldn't be completely paintable, it should be like in the comic and show where it can only be slightly painted under the eyes and such with small highlights. On terms of when it should be added, (if it even gets qualified) it should be a Halloween added item.