The “Ahsoka” series is expected to be set around the same time as “The Mandalorian” – almost eight years after the events of “Return of the Jedi,” by which time the Rex character will be a chronological age of 44 and a biological age/appearance of a man well into his 80s (Morrison is 62).
Rex and Ahsoka are very close friends, having met each other at the battle of Christophsis after she was assigned as Anakin's apprentice. He took an immediate liking towards her and later congratulated her when she helped Anakin destroy the Separatists' shield generator.
Trivia. Rex is actually 31 years old, though his biological state is likely closer to at least sixty years, due to the accelerated aging that was genetically installed in all Clone Troopers.
Rex was added to the main cast of Star Wars Rebels television series, set fifteen years after The Clone Wars, in the second season. Now seemingly a much older man due to accelerated aging, Rex lives with fellow clone troopers Commander Wolffe and Captain Gregor.
Ahsoka outranked him because she was a Jedi, however Rex said, "In my book, experience outranks everything". Ahsoka then replied, "Well, if experience outranks everything, I guess I'd better start getting some!" The two became friends and Ahsoka got more experience, eventually outranking the captain!
New inquisitor arrives & Ahsoka and Rex meet again
What does Rex call Ahsoka?
Star Wars: The Clone Wars
Obi-Wan tells Anakin to take Ahsoka with him to meet Rex. Rex watches Ahsoka and Anakin argue. Ahsoka corrects Rex calling her a youngling with Padawan.
Whether or not he was the rebel commando named Nik Sant is the subject of debate: However, in the New Canon Rex did serve with Luke, Han and Leia at least once.
Throughout the series, Ezra was seen the ages of 14 in half of season 1, 15 in the second half of season 1 and most of season 2, 17 to 18 in season 3, and 19 in season 4. Ezra was a boy with tan caramel skin, deep, sapphire blue eyes and was a lean teenager.
While listening to Kanan retell the events of Order 66 to Ezra, Rex reveals to the two that he and his fellow retired soldiers removed their control chips prior to the killings of the Jedi. He was never involved in the betrayal that Kanan holds against him.
That would be Kix. Due to his being frozen in stasis by the Separatists, he survived for 50 years after the end of the Clone Wars before being awakened by a pirate gang several years before the events of the sequel trilogy.
The Clone Wars co-creator Dave Filoni confirmed in a 2011 interview with IGN that the tally marks represented kills. "[Rex is], like, this veteran now," he said, "and he's got little kill marks all over his armor." He added, "Rex doesn't believe that the new armor is really that good.
He told the Death Watch warriors that Ahsoka was his betrothed, a ruse the Padawan reluctantly played along with. In Death Watch's camp, Ahsoka warned him that he was unwise to trust the Mandalorians. Mindful of their cover story, Lux quieted her by grabbing her and kissing her.
As the conflict raged on, she learned that its politics were not as black and white as she once thought and eventually entered into a relationship (and marriage) with Lux Bonteri, son of former Confederate senator Mina Bonteri.
Summary. Ahsoka Tano has had romantic connections with Lux Bonteri and Kaeden Larte, but due to circumstances and their involvement in the war, the relationships didn't work out.
Several consider Sabine and Ezra as a romantic couple while others consider it strictly platonic. Though they were confirmed to have a sibling dynamic, there are several aspects that they have romantic feelings for another.
Despite being absent from The Rise of Skywalker, Ezra's experience as a Jedi who resisted the dark side could have been useful in navigating Palpatine's ploys. His exclusion from the Jedi voices scene suggests he may be alive during that time.
As far as you know, Anakin Skywalker and Captain Rex were very close friends during the Clone Wars. But before the battle for Coruscant, they had to split up and Rex went with Ahsoka to Mandalore, and Anakin went to Coruscant. After that, Anakin and Rex never saw each other again.
Darth Vader's true identity as Anakin Skywalker was a highly guarded secret, known only to a select few individuals including Palpatine, Obi-Wan Kenobi, Luke, Han, Leia, R2-D2, C-3PO, Master Yoda, Bail Organa, Ahsoka Tano, Darth Maul, Grand Moff Tarkin, Grand Admiral Thrawn, Jocasta Nu, Ferren Barr, Verla, Reva, ...
This indicates that Rex hasn't interacted with Obi-Wan since the Clone Wars, making an appearance by Rex in Obi-Wan Kenobi impossible without contradicting Rebels.
He was close with Marshal Commander Cody, with their relationship mirroring that of their respective Jedi Generals, Skywalker and Obi-Wan Kenobi, whom Rex was also well acquainted with. Rex and his companions often worked together during the front-line campaigns against the Confederacy of Independent Systems.
Anyway, in answer to your second question, Rex is not a Mandalorian. His armor bears a resemblance to Mandalorian armor, however, because the clone template Jango Fett wore Mandalorian armor, and the armor of clone troopers was based upon Fett's.
