Kōshirō is a main character of Ginga Densetsu Weed in the Hybrid Arc.

He is the youngest and only living son of Joe and Hitomi.


He has greenish-brown eyes and pale red fur.


Like his uncle Weed, he is calm and polite and very excited to know that he has other family members.

Ginga Densetsu Weed

He was born in the mountains along with his three brothers, but his brothers and Hitomi were killed the Hybrid Grizzly Bear.

Joe realized that one of the puppies survived and named him "the happy fourth son", so he could live happy, not just for himself, but for his brothers.

Kōshirō became Ninomiya's pet, just like his father, and was called "Chibi" by him.

He later met Koyuki and Kotetsu while hunting. Kōshirō also met his uncle, Weed, but Joe didn't want to be in any terms with him and beat up his son when he went to see him.

Later, Kōshirō was taken to safety during the battle against the hybrid bears. After the battle was over, Kōshirō went to live in Ōu with his father.

Ginga Densetsu Weed: Orion

When the volcanic eruption destroys Ou, Kōshirō is seen fleeing with the other Ou warriors.

After that, he is not seen or mentioned in this series, as such it is unknown if he survived the volcano eruption or not.


  • When looking at the first coloured images of his great-great-grandfather Shiro, Kōshirō resamble his fur colour.
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