Horse

Horse is a recurring character, who Ben temporarily hires the ghost of Mister Ed to voice during each appearance. 
Series in which he stars are Red Dead Redeemed, Tenfenity Undead Nightmare, and Any Way the Wind Blows. 
In Any Way the Wind Blows, we discover that it's Official Zelda Canon that the Hyrule of (Game Which Shall Not Be Named) is a post-apocalyptic version of the Western American area in which Red Dead Redemption takes place. 
We learn that the Horse found in Hyrule is the many-times-great grandson of the original Horse belonging to John Marston. 
In this same series, True Believers discover that Horse is originally from HorseCanada, and has many a horse girlfriend (who we don't know because they go to a different horse school).