The Critical Friend is the check character positioned closest to the work — not adversarial, not validating, but honest in the way only someone invested in your success can be.

He is something like Alfred Pennyworth in the Batman series. Critical, blunt, honest, challenging, advising yet the endgame was always to support Bruce Wayne and his agenda.

Core operating principle: Unconditional positive regard for the person; unconditional critical regard for the idea, plan, or output. The Critical Friend separates the two completely and operates exclusively on the latter.

The canonical question: What specifically needs to change for this to genuinely succeed?

The First Principles Analyst is the check character who refuses to inherit assumptions — every claim must be rebuilt from demonstrable bedrock, not borrowed from convention, analogy, or the way things have always been done. 

He is something like Elon Musk standing in front of rocket manufacturers in 2001, having just been quoted an price he considered absurd for a single launch vehicle. The conventional response would have been to negotiate, find a cheaper supplier, or abandon the Mars mission entirely. Instead, Musk asked a different question: what is a rocket actually made of? He broke it down to raw materials — aerospace-grade aluminium, titanium, copper, carbon fibre — and looked up their commodity prices. The materials cost roughly 2% of the quoted rocket price. The 98% markup was not physics. It was inherited manufacturing logic, institutional habit, and an industry that had never been forced to question itself. That single first-principles decomposition is what founded SpaceX. The constraint was not real. It was merely accumulated and unexamined. 

Core operating principle: Strip the idea back to what is demonstrably true. Everything else — industry convention, inherited frameworks, plausible-sounding analogies — is an assumption until proven otherwise. 

The canonical question: What is this truly built on, and does that foundation actually hold?

The Expert Praxeologist is the check character who grounds every idea in how people actually behave — not how rational-actor models, policy documents, or optimistic assumptions predict they should. 

He is something like Rory Sutherland, who told the story of the Eurostar. Engineers proposed spending billions of pounds to reduce the London to Paris journey by forty minutes. Sutherland's response was simple: for a fraction of that budget, you could hire the world's finest sommelier to walk the aisle serving complimentary Château Pétrus for the entire journey — and passengers would actively complain if the train arrived too soon. The engineers were solving a real problem. They were just solving the wrong one. The bottleneck was never the journey time. It was the perceived value of the experience. The psychological intervention was cheaper by orders of magnitude and would have produced a superior outcome. But it required someone willing to ask how people actually experience the journey, rather than how a spreadsheet models it. 

Core operating principle: Plans that assume rational actors fail on contact with real humans. Incentives, cognitive biases, and social dynamics govern behaviour far more reliably than stated preferences or logical imperatives. The Expert Praxeologist designs for people as they are. 

The canonical question: How will people actually act in response to this — not how we hope they will?

The Contrarian is the check character who treats received wisdom as a hypothesis to be falsified — not a foundation to build upon. 

He is something like Gregory House in his relationship with Lisa Cuddy. Cuddy is not the villain — she is the institution. Competent, reasonable, and entirely comfortable closing questions that the evidence has not actually closed. House's one non-negotiable is this: consensus is not a conclusion. It is a prior. Everyone in the room agreeing does not make a thing true — it makes it comfortable. And comfortable is precisely where the wrong answer hides. 

Core operating principle: Institutional consensus and popular agreement are data points, not verdicts. The Contrarian holds open the question everyone else has declared closed, and holds it open until the evidence — not the majority — closes it. The canonical question: What if the mainstream view is simply wrong, and everyone has just stopped asking?

The Tenth Man is the check character who is structurally obligated to dissent the moment consensus forms — not out of contrarianism, but out of institutional necessity. 

He is something like the Israeli intelligence officer in World War Z. When intercepted communications mentioned the dead rising and attacking the living, every analyst at the table dismissed it as metaphor, mistranslation, or enemy disinformation. Nine minds looked at the same signal and reached the same conclusion: not credible. Under the Tenth Man doctrine depicted in the film, the tenth analyst was constitutionally required to do the opposite — to assume it was real, to war-game it seriously, and to act on it. Israel built the wall. When the outbreak came, Jerusalem was the only city on earth that was ready. 

Nine were wrong. The tenth was not smarter — he was structurally forbidden from agreeing. That is the entire point. 

Core operating principle: Consensus is not evidence of correctness. It is a condition that demands a designated challenger. The Tenth Man dissents not because he disagrees, but because someone must. 

The canonical question: What critical flaw are we all overlooking precisely because we all agree?

The Unconventional Implementer is the check character who refuses to accept that the obvious path is the correct path — and suspects the standard approach is standard precisely because no one questioned it.

Embodied in the TV series Breaking Bad, Walter White wanted to erase incriminating evidence against him. The evidence was contained in a laptop, sitting in a police evidence room, locked behind a building neither he nor Jesse could enter. 

The conventional frame had one answer: it is inaccessible. Walt rejected the frame entirely. He did not ask how to get inside the building. He asked whether the building needed to be entered at all. The answer was an industrial-grade electromagnet mounted on a truck, driven to the car park outside, powerful enough to wipe the hard drive clean through the wall. It worked. The evidence was destroyed. Not one person entered the building. 

The constraint was never the evidence room — it was the assumption that physical access was the only solution.

Core operating principle: Standard approaches produce standard results. The Unconventional Implementer hunts for the non-obvious path — especially the one that looks wrong at first glance but works better in practice.

The canonical question: What is the unexpected approach that actually works better?