Higgins was in his second season with the Bobcats. He had career averages of 3.7 points, 0.9 rebounds and 0.9 assists in 10.3 minutes in 44 games.
The 6-foot-7 Adrien joins the Bobcats from the Rio Grande Valley Vipers of the NBA D-League, where he averaged 17.6 points on 56 percent shooting and 11.2 rebounds in five games.
Adrien attended the Bobcats' training camp this season. He has appeared in 31 career NBA games over two seasons for the Warriors and Rockets, averaging 2.5 points and 2.6 rebounds. He played in eight games with the Rockets last season, averaging 2.6 points and 2.8 rebounds.
Charlotte's roster stands at 14 players.