Shiju is a member of Uruha Maboroshii. There wasn't really any background information about Shiju, except that he has had a lion's DNA implanted inside him by Genjuro, which allows him to change into a lion-like creature. Genjuro calls him a chimera. Shiju has a very nasty habit of eating his opponent's corpses. He is defeated by Kaoru Koganei. He has a much more humanoid appearance in the manga that can sprout a large number of spike and increases the size of his fangs and claws.
In the manga, he is call 'Shijo', instead of 'Shiju'.