When a goo pony dies their core will be left behind. Over thousands of years it can crystalize, but be very careful not to touch it or you’ll turn into a goo pony in an instant :P
And the rest:
Regular form
Harpy form
Inflatable form
Skunk form
Lamia form
Portrageist form
Siren form
Goo pony form
Twilight Sparkle form
Zebra form
BONUS: LIVING DRESS
BONUS: SHADOWBOLT
Star tracker: [gloop gloop gloop gloop gloop]
Most of them are super chill. They don’t exactly have a reason to attack you when there’s basically nothing you can do to them aside from mildly irritate them :P
Melt them in lava like the T-1000, but who would want to hurt these goo ponies anyway? It’s not like they have a mission to hunt you down and absolutely will not stop until you’re dead. :P
Depends on what they’re up against. It’s practically impossible to hurt them with a lot of things, like a blade would just go clean through, a bludgeoning weapon would just splatter them and they’d reform, and even a blast of magic would cut through them with minimal damage. On the other hand, extreme temperatures and lots of water can easily be fatal to them by freezing, melting, or diluting them. Ones with cores are more resilient to their natural weaknesses, but the core itself is also a serious weak point :D