角 is pronounced jué (not jiǎo) when it means 'role.' jiǎo means 'corner' or 'horn.' This is a common mistake even for native speakers.
usage
角色 works for both fictional characters and real-life roles: 主角 (zhǔjué, main character), 配角 (pèijué, supporting role), 扮演角色 (bànyǎn juésè, play a role).