He was who planted the idea to get other beings to become Guardians to the Guardian High Council  he was also who kept an eye on Kourin and Yaya during their test and specially on Kourin after she failed to become one. Kourin and him fight alot but what siblings dont? the two how ever would murder anyone who messed with their sister Seirin.

Shoryu was surprised when his sister Seirin decided to become a Fangless it was the first time one in their family did such a thing most  usually just pulled toward either be more like their demon side of the family or blend with humans, Seirin decision was something he believed had to do with her weak body since she had often been sick and in this way his nephew Yuki reminds him of her and would not be surprise when like Seirin he decides to become a fangless.

Shoryu had a mate, a water goddess but because of his duties as a guardian he had to choose her or being a guardian a choice he knows his mother once had to take, unlike her he chose to remain a guardian not because he did not love his mate but because had he chosen to be stripped of his guardianship  he would not be able to remember anything he did as a guardian which meant he would not be able to remember meeting his mate. Not long after his Mate dissappeared her last words to him were "Move on and be happy". He believes his mate having lost the faith of people slowly dissappeared and although he would always remember her that did not meant he was not going to deny the possibility of falling in love again after all his parents were proof that love did not come once in a life time.