The one with pink hair is Shimizu Raikou.
In order to seize the position of Shimizu patriarch, his uncle Quansuke killed Lei Guang's parents and many people. On his deathbed, his mother ordered Lei Guang to pick up the symbol of Shimizu clan "I smell it" and slay the traitor Quan Jie. After defending Shimizu's dignity for the last time, he joined the wolves. In order to leave a righteous image of Shimizu family in the heart of his sister Lei Ming, he bears everything and is even mistaken by his beloved sister for the murderer of genocide. Now the gray wolf and the Russian rain are working together. When he is in a bad mood, he will put on some strange clothes. He is still left-handed. (See episode 10 for details) In the TV version, he died at the hands of Hattori. Because Renqing used Rosen Vientiane, it was impossible to find his body. In the cartoon, he left the grey wolf with Russian rain and decided to revive the Qingshui family.