Yeh the whole point is the scariness is because she's a realistic kind of scary, with the psychosis paired up with a willingness to kill without remorse when given a "good" reason. The tragedy caused the psychosis, which caused bad things when mixed with the latter, far as I can tell.

I also think that it could be spelled as "Len" still, because it clearly is a reference to Kagamine Len as it's applied first to the Len character. < < I don't see why it can't still be a reference to Len just because we know now why Kayo called Kokutan Len. 

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