Obi-Wan Kenobi

Clyde Langer figured that since Luke Smith was Luke, that would make him Obi-Wan Kenobi, as he was teaching Luke what to do at laser tag. (TV: Warriors of Kudlak)

Amy Pond cried out, "Help me, Obi Wan!" upon seeing a hologram of herself. (PROSE: The King's Dragon)

Captain John Hart similarly said, "Help me, Obi-Wan Kenobi. You're my only hope," as an actual hologram, talking to Jack Harkness. (TV: Kiss Kiss, Bang Bang)