[yeeeeeeeeee]

Everything you're good at they shouldn't be and everything they're good at you shouldn't be.

Startups are an exercise in risk mitigation and cofounders mitigate your intrinsic/personal risk. (Every human has flaws.)

VCs and angels often talk about team risk and how its better to have multiple (but not too many) founders. This is because every individual has flaws and founders offset each others. The team risk is the sum total of the founders intrinsic risk. To give yourself the best shot, find someone who will hold you while bombs are going off in the trenches but isn't totally like you. (Same reason why "diversity" is important)

That said culture is THE MOST IMPORTANT THING so you definitely have to be compatible.

Your wife is not like you, but you still love her. Find someone who is different but you can love through the hard times.