After giving it the Big Think™, I think I'll play as a Dark Urge monk with shadow specialization.
Makes sense to be a monk fighting inner demons through discipline, makes sense to be a shadowy guy if you are a serial killer, and makes sense as a solo class in case I sorta kinda kill everyone else.
What's a good build for multiclassing this? I don't want to splash too much, or too late, because I want my ki points and martial bonuses, but maybe a bit of Rogue? For sneak attacks? Or a lot of rogue, for Assassin?
Depending on how Larian implemented Wild Shape, Druid/Monk can be an extremely fun and versatile build. It hinges on them implementing monk abilities and flurry for wild shape, however. Even if they don't, a work-around is to take Druid of the Spores since that subclass effectively replaces Wild Shape with your spores, and synergizes with being in melee.
It's probably not a top tier meta-build, but I have been strongly considering it. I think I'm going to end up with pure class Lore College Bard Dark Urge though. The prospect of succeeding on every skill roll ever with just 1 character is too good.
Unless I'm mistaken in how difficult skill rolls will become later on, I believe every single online guide currently is *dead wrong* on how to build a Bard skill-wise. After preliminary testing, I believe it is a GIANT mistake to take proficiency in Persuasion, Deception and Intimidation. With Friends being active on every single diplomacy roll + Guidance on most of them, the Bards CHA-modifier + Jack of All Trades will absolutely demolish those rolls. This means you automatically have all speech skills covered just by picking bard. Hence, you save three skill proficiencies to put in stuff like Perception and flavor skills.
If you forego optimizing for combat attributes (which isn't necessary on a bard anyway - you just need CHA), this means that you could theoretically cover *almost every single skill in the entire game on just your MC*.
For a first playthrough, that seems hella fun, and since with how Cutting Words works with saving throws, you can bypass the useless implementation of Bardic Inspiration and just use your Bardic Inspiartion to control enemies (by making them fail their saves vs your CC spells). So you'll have a completely AS-independent support character who can cover all your skill check needs while being a fairly versatile caster (control spells when needed, buffs when not, cantrips can be damaged focused or Vicious Mockery for debuffing as needed).
Do note that the above assumes a Lore College bard, as they have Cutting Words + gain three skill proficiencies.
Yosharian might have opinions on monks