As fans campaign for a second season of “Queen Charlotte,” we’re still reeling from season one’s incredible performances, namely Arsema Thomas’s impressive portrayal of Lady Agatha Danbury. In “Bridgerton,” Lady Danbury is an established noblewoman with a reputation for being a natural leader. In the spinoff, however, viewers catch a glimpse at her early life as an aristocrat, including her friendship with Queen Charlotte (India Amarteifio), her complex relationship with Lord Danbury (Cyril…