I don't care how this goes down; when you need a droid at all, then HK-47 is the very best there is (and forever will be, at least in my heart). However, Ezio is great, and Kenshin is OK but nowhere near the droid.
There goes my nominations.
Ezio
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HK-47: The very best there is when you absolutely positively have to kill every meatbag in the room. Accept no substitutes!