recurring character是什麼樣的角色呢？

簡單來說這個角色並非固定班底，但是經常會出現在影集當中
有時會有幾集是以此角色為中心，此角色出現的多寡則是看人氣來決定

以下wiki解釋：

A recurring character is a fictional character, usually in a prime time TV
series, who is a character, that appears in a few episodes, but also appears
from time to time during the series' run.[1] Recurring characters often play
major roles in an episode, sometimes being the main focus. The character's
return is based on popularity.