Did you know it is the first WrestleMania for the competitors:

Cesaro
Curtis Axel
Bray Wyatt
Brad Maddox
Damien Sandow
Darren Young
Heath Slater
Jinder Mahal
Sin Cara
Titus O'Neil
Cameron
Emma
Eva Marie
Naomi
Summer Rae
Tamina Snuka
It is also the first WrestleMania as a competitor for (as they have previously managed someone):

Brodus Clay (who managed Alberto Del Rio along with Ricardo Rodriguez against Edge for the World Heavyweight Championship at WrestleMania 27)

Aksana (who helped manage Team Teddy against Team Johnny at WrestleMania 28)

AJ Lee (who managed Daniel Bryan against Sheamus for the World Heavyweight Chamopionship at WrestleMania 28 and managed Big E Langston and Dolph Ziggler against Kane and Bryan for the WWE Tag Team Championship at WrestleMania 29)

That's a lot of names, but it's to be expected with two battle royals on the card.