Name: Edwin Jarvis
Other Names: Jarvis; Crimson Cowl
First Appearance: Tales of Suspense (vol. 1) #59 (Nov. 1964): "Captain America"
Number of Appearances: 669
Comic Book Appearances: 660
TV, Film Appearances: 7
Video Game, Computer Game Appearances: 2
Teams/Affiliations: The Avengers (staff)
Ally: The Avengers
Typically known simply by his last name, the butler Jarvis is the most trusted non-superhero ally of the Avengers.
Jarvis briefly masqueraded as the Crimson Cowl (see Avengers (vol. 1) #54), but he has generally never had any sort of costumed identity.
Suggested links for further research about this character and the character's religious affiliation: