Which Fictional Character Had The Best Onscreen Introduction?
Aaron Sorkin loves a strong entrance, doesn't he?
A movie or show is only as strong as the characters it consists of, methinks.
ABC
However, where there's a strong character, there's an even stronger character entrance.
CBS
Like Will McAvoy's impressive monologue about how America is no longer the greatest country in the world on The Newsroom:

HBO
You can watch the full scene here.
Or Miranda Priestley's "loin-girding" entrance into the Runway offices in The Devil Wears Prada:

20th Century Fox
You can watch the full scene here.
Or President Bartlett's Christ-like end-of-episode arrival on The West Wing:
NBC
You can watch the full scene here.
Or maybe it was Miranda Bailey's iconic list of expectations on Grey's Anatomy:

ABC
You can watch the full scene here.