|Partner||Shima Tokashiki (husband)|
|Relative(s)|| Masaru (son)|
|Manga Debut||Animal 10|
Hiromasa is famous at the hospital where he works as a surgeon. The nurses adore him as the gentle, good-looking doctor, and often comment about how he's nothing like a snake and more of a golden retriever given his blood-line (and why he is only partially heavy-seed). He always appears with gentle smile and never talks bad about anyone; he is caring and nice to everyone but underneath it all, his personality is completely the opposite and his outward personality is mostly just a farce! Beneath all the kindness and clam, Hiromasa is actually quite arrogant, mean and shrewd just like any other serpent. He is possessive of people he love; e.g: when Shima got pregnant and suspected that the baby was Kunimasa's, he forcefully tried to make Shima abort the baby (by pressing the magoose's belly!)
Hoshino is a madararui, he is able to see people's soul to know whether they are either a madararui or kakuen. His madararui is a jyanome and he can transform into a habu (Japanese snake). He is stronger than an average person and he is very likeable person because of his dog trait.
- In Japanese, Hiromasa mean "wise and straightforward."