I started binge watching the show as well. It seems like different characters use different styles, and some of it is also blurred with movie style wire work. Sunny also uses different styles, but definitely see Wushu and Choy Lay Fut. The guy in the wheel chair used some Wing Chun techniques. It looked like in some other fights and training sessions, the different characters were practicing Wushu, Karate, Wing Chun, Tai Chi and Choy Lay Fut as well.
If you're interested in a learning a style that encompasses many of the techniques you see, check out Choy Lay Fut.