First Hoshikage

The was the founder of Hoshigakure two hundred years before the start of the series.

Background
Once he discovered a "fallen star" (a meteor) with mystical powers, he founded the Land of Bears, in hopes to make well-renowned shinobi and gain the title of a great hidden village. Unfortunately, he didn't know of the side effects of the star training, and people started to die from overpowering chakra that imploded in their bodies.

Abilities
Due to his high rank, the first Hoshikage was presumably a very powerful shinobi. He discovered the usage of the star Hoshigakure became famous for and was possibly very aware about the positive things about the star training. However, he did not know about the side effects of the training, which could mean he had not enough time to realise the danger coming from the star.