Aside from a base colourist or assistance with backgrounds, I'm very happy working on it alone.
I quite enjoy sketching, line art and shading so I wouldn't like to hand that over to someone else. Maybe it'd be nice to get assistance for that for pages that are less important, but that likely won't happen anytime soon. And even then, they'd have to replicate my style pretty well because I want it to look consistent.
I would not work with another writer just because I have a very specific vision for my story, and I don't like writing with other people. An editor, maybe but I'm happy just editing it myself and asking my friends for feedback every once in a while.
My projects are very special to me, and I like being able to work on them alone even if it means less pages get posted. I just like that anything I say goes, and I'm able to make my comic whatever I want it to be.