Kevin, I'm sorry to hear of your loss.
Have any of you been in a relationship with someone who becomes needy?
Graviton, you use "needy," where I use "clingy." To me, everyone has needs of various kinds. That doesn't necessarily make them automatically "clingy" in their behavior as they go about trying to meet their needs, or ask for help meeting their needs.
... either because you have withdrawn a bit due to time constraints, or emotionally, due to stress. How do you react to the person and usually handle it?
I don't react. I plan ahead/cope.
I give my partner the heads-up that work or whatever is going to be taking up my time for a bit, so he can prepare and weather it out well by making his arrangements and working out something for our shared responsibilities, like home and kids.
I let them know if I'm currently processing something heavy, so I'm not going to be my usual chipper self for a time.
They could do similar if they are experiencing something. I don't mind talking things out and working out a plan together to cope.
Again, I use "clingy" where you use "needy." Changes in blue mine:
Are poly people generally more (clingy) or less (clingy)?
A clingy person could learn better coping skills before attempting a polyship. Otherwise they are going to have a hard time with the extra emotional management that multi-person relating can bring.
Does a person who is independent (something I consider to be a hallmark trait of poly people) tend to be less (clingy)?
Yes, IME, independent people aren't especially prone to clingy behaviors.
I also think this is about personalities and introversion/extroversion. There will be introverted poly people. There will be extroverted poly people. Some of them like time on their own to charge their batteries. Some of them get charged by being with people. Different personality needs, but not necessarily clingy behavior.
If there is a scale from 1-10, where 1 is the person who likes being alone a lot, and 10 is the person likes to do stuff with people a lot, that's not about "clingy," to me, but "compatibility."
A (3) and a (6) might work it out okay. The gap between them isn't so far to bridge. The (3) could sometimes socialize more than preferred for the sake of the shared relationship. The (6) could live with less time with (3) than preferred for sake of the relationship. Be willing to meet some of their socializing need with other people. It isn't same as spending time with the (3) person, but they put up with it so the (3) can have their alone time, and because next week is their turn. Everyone can be okay and happy enough. The need gap is smallish -- 3 points apart.
A (2) and an (8) may have a harder time with this. The 6-point gap is maybe too much, even taking turns at it, because even taking turns, a 6-point gap is twice the size of a 3-point gap. Too big a leap to handle and still feel okay, happy enough. This pairing may be better off accepting it won't fly, than to keep trying to fly a thing that won't fly well.
I think the introverted/extroverted spectrum thing is a dating compatibility that could be examined.
But just on the "clingy" thing, IME, so far, "clingy" behavior comes coupled with whining behavior, "glomming on" behavior, not respecting limits or boundaries, not learning enough coping skills, and a whole list of other things I dislike.
"Clingy behaviors" turn me off. Plain and simple.
"Extroverted" does not turn me off. But as an introvert, I don't hang with my extroverted friends as often (they have other friends) and I do not date them. We'd be incompatible for dating, but fine for friendship.