Over its seven-season run, Agents of S.H.I.E.L.D. introduced many exciting characters who were beloved by fans. From series staples, like Leopold Fitz and Melinda May, to original takes on established comic book characters, like Mockingbird and Ghost Rider, these depictions became iconic in their own right, as did many of the relationships that arose between them.
Source：https://www.cbr.com/popular-agents-of-shield-ships-ranked/
