Big Mom and her nearly-entire family and crew save for Katakuri, and even he isn't totally safe from Oda screwing him in some ways.
Kaido and his crew as well, they had much potential as well but Oda barely even made any effort to properly characterize them and to write their past, relations and dynamics.
Both crews were ridiculously handicaped and held back in bad ways by Oda.
Also Smoker and Tashigi, most of the Supernovas such as X-Drake, Apoo or Hawkins, the Gorosei and Kizaru in Egghead, Tsuru, Garp, Dragon, etc...