Besides Jason, what character appears in the most Friday the 13th movies?

Other characters came and went, but Jason's mother, Pamela Voorhees,
returned over and over in flashbacks and dream scenes.

Jason's mom appears in five of the films. Mrs. Voorhees is killed in
the first "Friday the 13th," but that doesn't keep her from showing up
(often in archival footage that was reused repeatedly) in the sequels:

Friday the 13th (1980)
Friday the 13th Part 2 (1981)
Friday the 13th Part 3: 3D (1982)
Friday the 13th: The Final Chapter (1984)
Freddy Vs. Jason (2003)

The runner-up, a character named Tommy Jarvis, appears in four "Friday
the 13th" movies:

Friday the 13th: The Final Chapter (1984)
Friday the 13th: A New Beginning (1985)
Friday the 13th Part VI: Jason Lives (1986)
Friday the 13th Part VII: The New Blood (1988)

I verified this information by doing searches for the character names
"Pamela Voorhees" and "Tommy Jarvis" on the Internet Movie Database
site:

Internet Movie Database
http://www.imdb.com/search

I hope this is helpful. Please request clarification if anything is
unclear or incomplete; I'll be glad to offer further assistance before
you rate my answer.

Best regards,
pinkfreud

Thanks.  Excellent searching :)

Thank you for the five-star rating and the tip!

~pinkfreud