The Ballad of Adler Young, Canto 2.5

You know, we've been told that the Duchess is a bad person but onscreen she hasn't done anything that objectionable. She schemes but so do everyone, so is there more to it?

Her agents get lowfolks to make hum.. er sentient sacrifices of bunny maidens
Burnside a member of her entourage who was raised in the Anteglade make it pretty clear what happen to these maidens (and generaly show a lot of disturbing enthusiasm for canibalism). and it's been said in general that's the unseelie seems to consider eating lowfolks perfecty okay this has been explicitely stated to be the case of habitants of the Anteglade.
a rigged be
And y'know last but defintively not least, she's the one who gave Adller the plague o' battle, pretty much full expecting him to use it.

She's not the only one by far but I'd say she has shown plenty of occasion of deserving her classification as unseelie. And proud of it.

(also rereading the recent archive, Is till wonder what the hell S.A.L.V Fifif Faufox (the non adler one) deal was exactly.She was supposed to 'take' Adller body, yet it seemd implied there was a little more than just sex or willies to it.)
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>Estvan: Tell the tale of what exactly happened to the Duke o'Daisies. It involves nightshade, a rigged bed and a cheese grater.