I see that the theme is SCOUNDRELS. How strict is the definition of this? I have been working on some playbooks for Cleric and Wizard (based on DnD tropes)
Dunno if you intend to adjust these tropes to Doskvol, nor the answer to your question, though, if you are looking for some inspiration, there are some interesting sources I can reccomend to you.
The Ovate is something of a mix between a monk and a druid. ( https://imgur.com/a/QPuPS )
The Shriek could very well fit the theme of a 5e warlock ( https://imgur.com/a/yeOwbuN )
The artist is like a "layers of fear" version of a bard ( https://drive.google.com/file/d/0B0w0-06KlXTeN09GcFd2TXpGNHc/view?usp=sharing )
There's also the iruvian playbooks :)