Mx. Fox

I would say it's a combination of things. Do you:

Share the same values?

Safely share being vulnerable with each other?

Have compatible personal needs and life/family goals?

Work as a team to accomplish what needs to be done on both the small and large scale?

Address when there is a power imbalance and work to reduce/resolve it?

Find ways to compromise when you have different interests or preferences?

Lift each other up?

Protect each other?

Still retain your identity separate from the other person?

twelve episodes, twelve contestants - a mix of annoying middle aged sci fi authors, fan fic authors and random people off the street

a variety of against the clock writing tasks, big finish scripts, ability to interact with actors without shouting at them and challenges where you have no budget or doctor for an episode

judged by solely by christopher eccleston