Mk56 is a common name for a Tsundere. Those nicknamed or named Mk56 are apart of the Mk series. They tend to differ between each model number however, 56 has survived the longest so far.

Briefly, "the realization that each random passerby is living a life as vivid and complex as your own." Originally from the Dictionary of Obscure Sorrows, which has a lot more beautiful neologism definitions like this you might enjoy.

LVI:
There may have been more Mks in the business, but there's a reason Mk56 is the last one left.

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