Tech Founders, What key attributes do you look for in a Co-founder? ❓❓

Hi everyone, I'm a tech founder...and I've just started working with an awesome co-founder. I've been through a few Startups with varying degrees of success, but I'd like to know what are the key skills you look for in a co-founder here are some of mine. I'm sure I'm still missing some and perhaps open to intangible risks as a result. Attributes: a different perspective - I'd hate to work with someone with a similar personality, I love to be challenged a skill I don't have - I may be able to sell, but I am not a sales executive. Sales and Marketing skills are not 2nd nature to me ..finally passion - Passion is something you can't quantify, you can review a track record or talk to mutual colleagues but for me passion is something I just feel from the way they speak and how accountable they are but most of all, they must be a good communicator. Communication builds trust.. I'd love to find out yours, perhaps we could build a checklist for other founders embarking on this journey