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A class that utilizes high-risk/high-reward mechanics.
Wouldn't that just be taking a penalty to success checks and increasing the effect? For example, PF1E's Power Attack. Seems trivial to implement, but could make a better archetype than a class.
A character who advances the plot by screwing up
I mean, anyone can try and fail and still advance the plot. That's more player choice to choose consequences than character mechanics.
I think the key thing is they somehow screw up, cause serious consequences for others but don't face serious consequences personally. Perhaps the player invokes this ability which results in some kind of bonus to not face the consequence (attacks against them, saves, etc)?
The characters you mention also play off the "lucky halfling" trope. Like the old line "Providence protects idiots, drunkards and children"
the power to manipulate distance
Yeah, I have no idea how to do that mechanically. That would basically need to rewrite all the rules on distance/range/movement. This sounds hard.
steals enemy abilities and uses them
This is a super common archetype in video games. It does kind of break the normal rules about character knowledge of enemy abilities. Quina Quen would be the character I'd base it off of (though Kirby is similar) . It pulls from ancient traditions of eating things to gain their power. Bite off the target's flesh and swallow to understand their powers, another bite and swallow with a declared target power to gain a use of that power. How you get this to progressively scale over 20 levels would be interesting, probably mostly relaxing restrictions as you grow.
I would totally make this Gourmand class. Plus, it gives a setting specific reason why people would want to kill monsters and collect their bodies. Probably can steal some aspects of barbarian and sorcerer. I think there was also a 1e Sorcerer archetype that gained bloodline powers based on drinking the blood of creatures.