Many unique and original characters from the Star Wars animated universe have been introduced into the franchise's live-action television series. Fans were ecstatic when Clone Wars' Ahsoka Tano appeared in season two of The Mandalorian and delighted over cynical yet charismatic Cad Bane's first live-action appearance in The Book of Boba Fett. With multiple live-action shows on the horizon, many more characters from the animated series The Clone Wars, The Bad Batch, and Rebels could be preparing to make their own live-action debuts.
The success of two seasons of The Mandalorian -- with Season 3 on the way at the end of the year -- and one season of The Book of Boba Fett is leading to an expansion of Star Wars' live-action world. Ahsoka is getting a solo series and Obi-Wan Kenobi is returning for a show of his own. Both projects open the door for many different cameos, like Darth Vader appearing in Obi-Wan Kenobi, and there are plenty of other characters who could fit into the live-action universe.
Lux Bonteri
The son of Separatist Senator Mina Bonteri, Lux Bonteri was introduced in The Clone Wars when Senator Amidala and Ahsoka Tano travelled to Raxus to see about a potential treaty between the Republic and the Separatists. Ahsoka had never met a Separatist and Lux had never met a Jedi, but despite their differences they became fast friends. He appeared in a few more episodes of The Clone Wars and Ahsoka developed a crush on Lux that was reciprocated, but given her Jedi status nothing came from it.
Lux's arc in The Clone Wars ended with him becoming Senator of Onderon after the death of his mother, making him an ally of the Republic. Given his history with Ahsoka and his positioning as a political figure, it is possible fans will see an older Bonteri in the Ahsoka series, and his charm and wit would fit the live-action screen well.
Omega
Omega appeared in The Bad Batch as a pure genetic replica of Jango Fett and lived on Kamino as a medical assistant to Nala Se. In the immediate aftermath of Order 66, Omega took an interest in Clone Force 99 -- a group of defective clones known as the "Bad Batch." When Admiral Tarkin came to Kamino to assess the remaining clone forces, Clone Force 99 escaped with Omega in tow. She later attracted the attention of bounty hunter Fennec Shand, who made her live-action debut in The Mandalorian, and had a prominent role in The Book of Boba Fett after she became Boba's enforcer.
Omega, unlike the majority of the clones, has the potential of a normal human lifespan. Her status as a genetic replication also puts her alongside the only other exact copy of Jango Fett: Boba Fett. Her standard aging and her relationship to the clones who survived Order 66 all situate her to make a debut in any of the live-action series, though particularly The Book of Boba Fett. Omega is spunky, longing for family and connection, and is definitely the type to track down Boba because of their kinship.
The Bad Batch
Clone Force 99 -- better known as the Bad Batch -- was introduced in The Clone Wars, and later starred in their own spin-off series. A group of defective Jango Fett clones, their lineup originally consisted of Hunter (the leader able to detect electromagnetic frequencies from droids), Crosshair (a sniper with enhanced vision), Tech (the genius and computer whiz) and Wrecker (the brawn of the group). Echo, originally a member of the 501st, became a member of the Bad Batch after they rescued him from separatist forces around the end of the Clone War. Young clone Omega joined the group after Order 66, but Crosshair left after his inhibitor chip took effect.
Since The Book of Boba Fett established actor Temuera Morrison as Boba Fett, and thus the live-action face of the clones, he'd have to play any "regular" clone that subsequently appears in the live-action world. Since the Bad Batch is characteristically defective, however, their live-action casting could be looser and any one of them could appear in the Ahsoka or Obi-Wan series -- either individually or as an entire group. The Bad Batch have already been kind of seeded into The Book of Boba Fett.
Ezra Bridger
Originating in Rebels, Ezra Bridger was a Force-sensitive participant in the beginnings of the Rebellion. As the Jedi Padawan to Kanan Jarrus, Ezra had many encounters with established characters including Clone Captain Rex, Ahsoka and Darth Maul. He also had conflicts with Grand Admiral Thrawn after he took on more leadership responsibilities. Blaming the Sith for the death of his parents, his arc in Rebels had him searching for Obi-Wan Kenobi in an effort to destroy the Sith for good.
Ezra's ultimate fate is unknown, as the end of Rebels saw him and Thrawn sent into hyperspace indefinitely while Ahsoka Tano and Sabine Wren set off to find him. Natasha Liu Bordizzo has been cast as Sabine in the Ahsoka series, but other than her and Ahsoka herself, the majority of the casting is being kept under wraps. The DisInsider reported that Mena Massoud was rumored to be cast as Bridger, but the rumor stemmed from a YouTube video that has been since taken down.
Admiral Thrawn
Grand Admiral Thrawn made his Star Wars debut in Rebels as the antagonist assigned to help quell the Rebellion by destroying the rebels of the Lothal sector. A Chiss male, Thrawn was proficient in knowledge of the Unknown Regions, proving to be a great asset to the Empire. Though his first appearance was in Rebels, Thrawn knew Anakin Skywalker as a Jedi and later worked with Darth Vader. Thrawn is known for his terrifyingly calm demeanor and his love of art, and his fate was tied heavily to that of Ezra Bridger's, as at the end of Rebels, Thrawn and Bridger were thrown into deep space together.
Thrawn was confirmed to be alive, however, as he was referenced in The Mandalorian by Ahsoka Tano. Though The Mandalorian takes place almost ten years after the close of Rebels, Thrawn will likely be appearing in Ahsoka's series. A report from SmallScreen claims his voice actor Lars Mikkelsen is set to play Thrawn in Ahsoka, citing "undisclosed sources," but Disney+ has yet to confirm if the report is true or not.
Rex
Captain of the 501st, Clone Trooper CT-7567 is more commonly known as Rex. Rex had a prominent position in The Clone Wars as the second in command to none other than Anakin Skywalker. Over the course of The Clone Wars, Rex became increasingly disillusioned with the Republic and the idea of the clones' future after the war. He managed to escape Order 66 along with Ahsoka Tano, and in Rebels, fans saw him living on Seelos with fellow clones Wolffe and Gregor.
As mentioned with The Bad Batch, since the Clone Troopers all share the genetic material of Jango Fett, Temuera Morrison would presumably have to play a live-action version of Rex—but that doesn't mean the character couldn't appear in a live-action Star Wars series. Morrison has said he's open to playing Rex or any other clones in the future.
Asajj Ventress
Asajj Ventress is a Dathomirian with a checkered past. Making her first appearance in The Clone Wars, she was a particular thorn in the sides of Anakin Skywalker and Obi-Wan Kenobi, both of whom were frequently assigned to combat Ventress during the war. Over the course of her life, the character has been a Jedi Padawan, a Nightsister, a pupil of Count Dooku's and a Sith assassin. After a series of betrayals by various Sith, and the massacre of her former clan on her home planet, Ventress turned to bounty hunting and became a reluctant ally to her former enemies. Though fans never got to see the finale of her story in The Clone Wars, there is potential for a live-action appearance in Obi-Wan.
Kal Kestis
Kal Kestis is the player character in the video game Star Wars Jedi: Fallen Order. As the title suggests, the events of the game take place during the reign of the Empire, when Kestis makes it his mission to restore the fallen Jedi Order. Kestis has an encounter with Darth Vader while trying to protect the galaxy's Force-sensitive children. Kestis makes a difficult choice after that brush with Vader to protect the children from the Sith, and eventually flies off with his crew for parts unknown.
Kestis' appearance was modeled after actor Cameron Monaghan, who also provided the voice of Kestis in the game. Given the open ending of Fallen Order, and the character's likeness to his voice actor, it would be easy for Kestis to pop up in a live-action Star Wars property if Disney wanted to tie their TV shows and their video games closer together.