For the record, here's my idea of who owns each Wrestlemania:
Wrestlemania I: Vince McMahon
Wrestlemania II: Hulk Hogan or William Perry
Wrestlemania III: Hulk Hogan and Andre the Giant
Wrestlemania IV: Randy Savage
Wrestlemania V: Hulk Hogan and Randy Savage
Wrestlemania VI: The Ultimate Warrior
Wrestlemania VII: Sgt. Slaughter
Wrestlemania VIII: Ric Flair
Wrestlemania IX: Hulk Hogan
Wrestlemania X: Bret Hart, Owen Hart, Shawn Michaels, Razor Ramon
Wrestlemania XI: The Kliq
Wrestlemania XII: Shawn Michaels
Wrestlemania XIII: Bret Hart
Wrestlemania XIV: Steve Austin
Wrestlemania XV: Vince McMahon
Wrestlemania 16: Triple H
Wrestlemania X-Seven: Entire roster
Wrestlemania X-Eight: Hulk Hogan
Wrestlemania XIX: Brock Lesnar
Wrestlemania XX: Chris Benoit
Wrestlemania 21: Batista and John Cena
Wrestlemania 22: John Cena
Wrestlemania 23: Bobby Lashley and Donald Trump
Wrestlemania 24: Ric Flair
Wrestlemania 25: Undertaker and Shawn Michaels
Wrestlemania 26: Shawn Michaels
Wrestlemania 27: The Miz
Wrestlemania 28: Daniel Bryan
Wrestlemania 29: John Cena and The Rock
Wrestlemania 30: Daniel Bryan
Wrestlemania 31: Seth Rollins
Wrestlemania 32: Charlotte, Sasha Banks, Becky Lynch
Wrestlemania 33: The Hardys