The following female Superstars are listed on the official WWE roster page but not booked for a WrestleMania 35 match as of this writing - Alicia Fox, Lacey Evans, Ember Moon (injured), Maryse (pregnant), The Bella Twins (retired).
Fox was brought to New York City for WrestleMania 35 Axxess, but there's no word yet on if she will make her ring return during the 2nd Annual WrestleMania Women's Battle Royal. Fox has been out of action since February following an incident at a WWE live event where she came to work intoxicated. WWE Hall of Famer Arn Anderson was the agent assigned to Fox's match that night and allowed her to perform, which led to Arn's release from the company as Vince McMahon was said to be furious when he later found out about what happened. Fox was reportedly offered rehab, but there's no word on if she took the offer, or what has happened since.
WWE currently has 13 spots announced for the Women's Battle Royal. The inaugural WrestleMania Women's Battle Royal in 2018 had 20 participants. It's possible we see Fox or Evans work the match. Evans is being groomed for a big singles push, and WrestleMania could be the perfect place for the push to continue. The following Superstars are advertised for that match as of this writing: Asuka, Carmella, Naomi, Lana, Mandy Rose, Sonya Deville, Nikki Cross, Dana Brooke, Ruby Riott, Liv Morgan, Sarah Logan, Mickie James, Zelina Vega.
The following male Superstars are listed on the official WWE roster page but not booked for a WrestleMania 35 match as of this writing: Akira Tozawa, Eric Young, Killian Dain, Alexander Wolfe, Ariya Daivari, Big E, Xavier Woods, Bray Wyatt, Cedric Alexander, Dolph Ziggler, Dean Ambrose, Drew Gulak, Primo, Epico, Jack Gallagher, Goldust, Harper, John Cena, Johnny Gargano, Kevin Owens, Kane, Lio Rush, Mark Andrews, Mike Kanellis, Mojo Rawley, Noam Dar, R-Truth, Rezar, Rowan, The Singh Brothers, Brian Kendrick, The Undertaker, Sami Zayn (injured, returning imminently), Sin Cara (injured, returning imminently), Aiden English (205 Live announcer), Akam (injured), Jason Jordan (injured).
Superstars like Owens, Rawley and Truth could end up in the 6th Annual Andre the Giant Memorial Battle Royal. Rowan will come to the ring with WWE Champion Daniel Bryan for the match with Kofi Kingston, and Big E and Xavier will likely be out for that match as well. Rush will come out with WWE Intercontinental Champion Bobby Lashley for the match against Finn Balor's Demon King. Most of the cruiserweights listed could be left off the card. There's no word yet on top talents like Cena, The Undertaker, and Wyatt, but it was reported that Cena was expected to sign a WrestleMania return deal that was on the table. Harper is wrestling a match at Axxess this week, so it's possible we see him in the Battle Royal as well. Sami and Sin Cara have been rumored to be returning soon, and their returns could be saved for the Battle Royal. Some of the roster members we rarely see likely won't be used at all, such as Kane and Goldust. Ambrose is reportedly leaving WWE shortly after WrestleMania when his contract expires and there's been no word yet on his WrestleMania role, but he could get involved in the Roman Reigns vs. Drew McIntyre match, or the Seth Rollins vs. WWE Universal Champion Brock Lesnar match. Ziggler has been on a hiatus and there's been no word on a possible Battle Royal appearance for him, but he is performing stand-up comedy in the area this week.
WWE currently has 28 Superstars announced for the Andre Battle Royal. That leaves 2 spots open if they go with 30 entrants like last year. The following Superstars are advertised for the match as of this writing with the SNL co-stars being billed as 1: Colin Jost and Michael Che of SNL, Braun Strowman, Andrade, Apollo Crews, Titus O'Neil, Tyler Breeze, Jinder Mahal, No Way Jose, Bobby Roode, Chad Gable, Kalisto, Gran Metalik, Lince Dorado, Bo Dallas, Curtis Axel, Heath Slater, Rhyno, Viktor, Konnor, Ali, Shelton Benjamin, Luke Gallows, Karl Anderson, Matt Hardy, Jeff Hardy, Otis, Tucker, EC3.
As noted, the current WrestleMania 35 card looks like this:
WrestleMania 35 Host: Alexa Bliss
WrestleMania 35 Special Guest Correspondents: SNL's Michael Che and Colin Jost
WrestleMania 35 Featured Musical Act: Elias
WWE Universal Title Match
Seth Rollins vs. Brock Lesnar (c)
WWE Title Match
Kofi Kingston vs. Daniel Bryan (c)
WWE United States Title Match
Rey Mysterio vs. Samoa Joe (c)
WWE Intercontinental Match
Finn Balor as The Demon King vs. Bobby Lashley (c)
RAW Tag Team Titles Match
Zack Ryder and Curt Hawkins vs. The Revival (c)
No Holds Barred Match
Triple H vs. Batista
Triple H's career will be on the line.
Falls Count Anywhere Match
The Miz vs. Shane McMahon
Farewell Match for WWE Hall of Famer Kurt Angle
Kurt Angle vs. Baron Corbin
AJ Styles vs. Randy Orton
Roman Reigns vs. Drew McIntyre
Kickoff Pre-show: 6th Annual Andre the Giant Memorial Battle Royal
Colin Jost and Michael Che of SNL, Braun Strowman, Andrade, Apollo Crews, Titus O'Neil, Tyler Breeze, Jinder Mahal, No Way Jose, Bobby Roode, Chad Gable, Kalisto, Gran Metalik, Lince Dorado, Bo Dallas, Curtis Axel, Heath Slater, Rhyno, Viktor, Konnor, Ali, Shelton Benjamin, Luke Gallows, Karl Anderson, Matt Hardy, Jeff Hardy, Otis, Tucker, EC3, TBA
Kickoff Pre-show: 2nd Annual WrestleMania Women's Battle Royal
Asuka, Carmella, Naomi, Lana, Mandy Rose, Sonya Deville, Nikki Cross, Dana Brooke, Ruby Riott, Liv Morgan, Sarah Logan, Mickie James, Zelina Vega, TBA
Kickoff Pre-show: WWE Cruiserweight Title Match
Tony Nese vs. Buddy Murphy (c)