Well, I do lack greatly on the writing side so I do search for comic collabs. So, first and foremost:
• A good writer
Be able to create a story from start to end, with good dialogue, be clear and think on details (don't be lazy! describe or use references for characters, locations...)
• A story I love (and that can be monetized)
My final goal is always to profit from the comic. I'm not working for free, this is an investment lol so I have to think this story is so awesome that we gonna get rich or smth. But till then I should at least feel entertained enough.
• A good relationship/profesionalism/respect
If I sense a disturbance in the field I will start being less and less motivated till I quit. No winning award story can make me stay if the other person is a lower back orifice.
• Fair workload, equal levels of commitment and fair pay
If the other person writes a chapter and disappears for the month it'll take me to draw it, if they're not willing to try and reduce my workload one bit, and on top of that they expect 50/50(if profits are involved) well, you can imagine...