The pet dog of the Hoshikawa family, Mario is the only one other than Kouta Hoshikawa who knows about Exkizer, and often acts up to try and distract people from seeing things that would make them suspicious of Exkizer's true identity.

When aliens plan to invade earth, the young Kouta along with a giant robot from outspace named Exkaiser must team up to save the world and his friends.

[Blog](https://seiyukenkyujo.hatenablog.com/) | [YouTube](https://www.youtube.com/channel/UCQMLWMLYQPjWpF1HDE_iNQQ)

In August 2020, he was diagnosed with terminal stage 4 cancer, and has been undergoing chemotherapy treatment.

Passed away on March 15th, 2021 of acute heart failure. Had retired from voice acting in 1997 because of lost eyesight and an amputated foot from diabetes.