"He is a legendary warrior Yo-kai who has left behind many legends about his ancestors. He looks forward to crossing swords with the fierce warriors he meets while reading the riverside willow in his travels."
Yo-kai Medallium biography
"A warrior demon that has grown in strength after repeated battles with fierce enemies. His personality has become more belligerent, and he's a bit of a nuisance when he's in a bad mood, but in battle, he's more than reliable."
In his Lightside form, Bushinyan looks very much like his original counterpart, a blue cat with blue and yellow armor and a grey sword except he has similar features to Jibanyan, a slightly taller look and thin pupils. Also, the crescent on his helmet now has a hitodama shaped symbol on top of it.
In his Shadowside form, Bushinyan also looks similar to Jibanyan’s Shadowside form, wearing different attire and riding on a white horse with a flaming blue mane.
Bushinyan's Shadowside Form was actually first revealed as a Treasure Medal. The design was originally made by a fan for a "Design a Shadowside form contest".
In the Yo-kai Watch 4++ opening, the line next to the hitodama flame design on his helmet is mapped wrong.