As Blake Shelton prepares to exit “The Voice” after a dozen years and 23 seasons, the impact of the country singer’s enduring, anchoring presence as the NBC music competition series’ longest-running coach is already being keenly felt by his creative colleagues.

“From the start, Blake was kind, down to earth and funny,” says the series’ showrunner and executive producer Audrey Morrissey, who, like Shelton, has been with the series since its inception. “He’s the type of person that makes sure to have fun every day and makes sure those around him laugh as well.”

Shelton’s affable, easygoing and supportive approach has been felt far beyond what makes