Yeah Shadow was "wtf"
He's called an assassin by lore and word of mouth
You hire him
The only thing that's arguably un-assassin of him is you don't ever hire him in game to do specific hits. For the party he's like a hired bodyguard but I mean... there are assassins that do that too. Skulk in the shadows and kill people who go after their lord or whatever.
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No problem!
This is a cute and pop genocide of love!