#2 Least eliminations by a Royal Rumble winner (1 - Vince McMahon and Randy Orton)
Unless a Superstar is figuratively and literally gifted a Royal Rumble victory, this record can never be broken. One Superstar and one Chairman share this distinction, by eliminating just one person en route to winning the Royal Rumble Match.
Vince McMahon somehow won the 1999 edition, that too from number 2. He did not eliminate a single competitor until the end. McMahon eliminated 'Stone Cold' Steve Austin thanks to a major assist from The Rock. This Rumble victory was as underhanded as it gets.
A much fairer Royal Rumble victory came 18 years later, as Randy Orton came out on top in 2017 despite eliminating a solitary competitor. The Viper entered the match at number 23 and dumped Roman Reigns out to win a star-studded Rumble that featured Brock Lesnar, Goldberg, and The Undertaker.
All three part-timers entered the match towards the end, which might explain Orton's relative inactivity in terms of eliminations. Anyway, the only way this record could be broken would be if the final entrant of the Royal Rumble comes out after every other Superstar has been eliminated. Very unlikely, but interesting nonetheless.