#2 Kane
The Undertaker's onscreen brother is Kane, and he can be an ideal superstar to retire the Undertaker. Kane is not an active performer, and he wrestles occasionally. His last appearance was at Crown Jewel where he teamed up with Undertaker in a tag team match. Kane's appearance is similar to Undertaker, and two superstars had some memorable matches.
Kane made his debut in 1997, and he tombstoned the Undertaker in his very first appearance. In fact, Kane's first feud was with Undertaker. Kane became an invincible character, and he provided many splendid matches in his career. Kane won the ECW title once, Hardcore title once, Intercontinental title twice, tag team titles twelve times and the WWE title twice. He also won the Royal Rumble once.
Kane and Undertaker faced each other in Hell in a Cell match, Inferno match, and even buried alive match. Kane also faced Undertaker twice at WrestleMania, and the Phenom won both matches.