When evaluating founders with abrasive personalities, some VCs apply a specific mental model. As advised by Jason Green of Emergence Capital, if a founder's brilliance is perceived to be 50 times greater than their difficult nature, the investment is still worth making. This provides a framework for backing exceptional but challenging individuals.

Sequoia's founder taught that the best investments are in individuals who are both exceptional and "not so easy to get along with." These founders challenge convention and refuse to accept the world as it is, a trait that makes them unconventional but also uniquely capable of building category-defining companies.

While assessed during diligence, the true caliber of a founder—their passion, authenticity, and ability to "run through walls"—becomes starkly clear after the deal closes. This distinction is not subtle; the impact of a truly exceptional founder versus an average one is immediately evident in the business's trajectory.

Successful founders passionately defend their vision while simultaneously processing tough questions without defensiveness. This balance allows them to navigate the 'idea maze' effectively, learning and adapting as they go.

Investor Jason Calacanis outlines his key evaluation criteria for founders. The most lethal combination includes the ability to ship product quickly, an eye for elite design, and a deep, personal obsession with their mission. He notes that skills like marketing can be learned, but these core traits are essential.

Great founders possess a deep-seated, non-financial motivation—like revenge against former rivals or redemption from a past failure. This "Count of Monte Cristo" drive allows them to persevere through extreme hardship and turn down lucrative but premature exits, a key trait VCs look for.

When investing in other startups, James Watt weighs the founder's mentality as 80% of the decision. He looks for resilience and how they perform when their back is against the wall, believing this tenacity is the ultimate determinant of a business's success or failure.

The most driven entrepreneurs are often fueled by foundational traumas. Understanding a founder's past struggles—losing family wealth or social slights—provides deep insight into their intensity, work ethic, and resilience. It's a powerful, empathetic tool for diligence beyond the balance sheet.

Some founders are not driven by a specific mission but by a personality that makes them unsuited for traditional employment. A high sense of self-worth and an inability to submit to authority can be a powerful, if accidental, driver of entrepreneurship.