These figures were also known as Super Dino Monsters and there's a thread with extensive discussion and research from several years ago on our very forum, in the ID section.
These are the monsters upon which all the sculpts appear to be based. Some resemblances are more loose than others. All of these monsters originate from the Ultraman franchise with the exception of #12, which despite repeated searches I've only been able to conclude is based on King Caesar from Godzilla. None of these toys appear to be bootlegged from existing Ultraman toys, unlike the other companion line of these figures which uses slight modifications of Bandai 6" vinyls.