Depends on a couple of factors.
I ask myself the following questions:>Have there been any better figures of said characters lately?
If yes, work on replacing them. Sell/donate the older one.>Do I still like (insert franchise name here)
If no or not really, sell/donate the older one.>Do I even like this character? Or did I want him to have the group together?
This one is a tad tricky. If you don't like the character, but you only got him for the group. Get rid of the group. Only keep the ones you actually like.
Example: Based on your image I only like Storm, Rouge, Beast, Wolverine. I would get rid of the rest. But since I don't like X-men compared to other franchises, I wouldn't get these at all.
I also have made a tier list of importance of what franchise to focus on.
I don't believe in throwing away figures. If selling on ebay/yard sale/etc doesn't work. I'd comment donation to some thrift store.