Plugin that makes that You can have own porter pig. 1. When You right click at this pig inventory gui popups and You can put items to it. 2. Pig will follow You when You right click + shift on it. 3. When pig dies, drops contained items. 4. Pig have chest entity mounted on it. 5. You convert normal pig into porter pig by right click on pig while holding chest.
4 is not possible. The rest is, but I think something like this exists for wolves. Try looking for that.
Why? I can spawn pig with mounted Primed TNT. And: ExtraHardcoreMode plugin makes that any block can fall like sand or anvil. So if every blocks can fall that means that it's possible to make any block entity.
You could maybe use a falling-sand(falling-block) entity for it, but that would probably look very glitchy.
