John Cena is one of the most popular WWE superstars of all time, known for his hustle, loyalty and respect catchphrase. The Undertaker has had an impressive career spanning over 25 years in WWE, with an undefeated streak at WrestleMania that was finally broken in 2014. Roman Reigns is a third generation wrestler who has been pushed strongly by WWE management as the next big star, though fan reaction has been mixed at times.