Wondering where to donate gently used Hero Factory parts and pieces. Surely there are people who might want them. Not sure if Goodwill will take them. I have already tried eBay. Any other ideas? I'd hate to put them in the trash. I'm in the metro Atlanta, GA area. Thanks!
If I were you, I'd try one of the following:
If you wish to get some money for them, post them as an auction on eBay without a minimal (reserve) price. This way somebody will surely bid at least some amount, and the lot will be off your hands and on it's way to someone who actually wants it at least a bit.
Posting on local marketplace boards (like Craigslist, Facebook Marketplace, etc.) could attract some interested recipients as well, either for money or for free.
If you don't want to get any compensation for it, you could try local kindergartens - I suppose they would welcome additional toys for the kids there.
If all else fails, you could just pack them up in a bag, attach a note abut what it is and what are your intentions, then leave the bag in a playground for someone to find. This is the most risky option, as parents in your area might be rightfully hesitant to let their kids pick up anything remotely suspicious, but it surely beats throwing the lot in the trash.
For donating LEGO, I would look at local libraries. Many public libraries in my region of the US have "LEGO clubs" and are always looking for spare brick. I also agree with an earlier answer that you might want to look for any adult LEGO clubs in your area. Even if the adults fans are not interested in what you have they often have connections to people who want spare LEGO.
Another source for donations could be FIRST LEGO LEAGUE robotic teams in your area. These teams are often in need of spare parts and even Hero Factory pieces can be used for decorating the robots.
Whatever you do, don't put them in the trash. ABS is a very recyclable material, but furthermore LEGO is in high demand. It would be multiple levels of shame to put it in a landfill. My guess is that Goodwill wil take them, as I often bring the clone bricks to thrift shops when I separate them from second hand LEGO piles that I grab at yard sales or Facebook marketplace.