The official Star Wars site says that Ahsoka uses two sabers because she's such a “skilled duelist.” They write she “built a second green-bladed lightsaber with a shorter, shoto-style blade,” and she uses the shorter one to “complement her primary weapon.”
At the least, why did Anakin change Ahsoka lightsaber colors? Anakin changing Ahsoka's lightsaber color was a way to highlight their connection. ... He gave Ahsoka her lightsabers back, which were taken from her when she was banned from the Jedi Order. Fans of the character know that Ahsoka's lightsabers were always green, however, now they're bright blue just like her master's.
No less, what does Vader do with Ahsoka's lightsaber?
She kills the Brother and purifies the two crystals. So Vader might have used the crystal of Ahsoka's lightsaber for a part of the Sixth-Brother's lightsaber. Ahsoka is able to sense the crystal of the Inquisitor meaning that it might have belonged to her and so she is able to connect to her previous crystal.
What are white lightsabers?
A white lightsaber is an uncommon, neutral lightsaber blade color. In Star Wars Canon, Ahsoka Tano first wields a pair of curved-hilt lightsabers with white blades in the animated series Star Wars Rebels. In Star Wars Legends, a group of Force-users called the Imperial Knights wield white-bladed lightsabers as well.
Shortly after The Rise of Skywalker's released, he teased that Ahsoka could still be alive, and doubled-down on that in later comments, although he did not go so far as to explicitly state she was alive.
Darth Vader taking the saber represents Anakin's love for his first spiritual child, Ahsoka. It echoes the way he addresses her by name in Rebels' “Twilight of the Apprentice,” letting Ahsoka know that her former master is still in there somewhere. ... And Morai will bring Ahsoka to her senses.
The crew involved the Jedi Kanan Jarrus and Ezra Bridger, which created a connection with Ahsoka. ... While Ahsoka and Ezra are in this realm, Emperor Palpatine attempts to gain access to the world between worlds, so the heroes must resist this and leave, parting ways.
R2 definitely didn't belong to Obi Wan because he was always used by Anakin and then given to Senator Organa after order 66 and presumably still belongs to Senator Organa since he is being used by his adopted daughter (Princess Leia).
At the end of the duel, Vader very clearly raises his saber with intent to kill, but is stopped by the falling temple and Ezra's magic-Jedi-temple-that-can-somehow-teleport-and-time-travel-shenanigans. In summary, no, Vader did not feel sad/regretful that he “killed” Ahsoka.
“Old Friends Not Forgotten” reunited Anakin with his former Padawan for the first time after Ahsoka walked away from the Jedi Order. ... He's unquestionably thrilled to see her again—it's all over his face—but he let go when she left the Jedi life.
Ahsoka Tano is trained in various lightsaber fighting styles She began her studies with Shii-Cho, the most ancient style of lightsaber combat often taught to Younglings in the Jedi Order. After mastering the basics, Ahsoka grew to learn a more fast and aggressive technique called Form IV (or Ataru).
In our opinion, the Kaiburr crystal will top our list as the most powerful lightsaber crystal. This is because of how much it amplifies the wielder's power and how it allows the user access to Force abilities they would not have been able to otherwise use.
They matured only after thousands of years, and the glow they produced was caused by their inner light. Despite their biologic nature, rainbow gems could be used as lightsaber crystals. ... She used some of the crystals in her second lightsaber, after her first one malfunctioned and led to the loss of her arm.
Some members of the Jedi Order considered Qui-Gon Jinn to be a Gray Jedi. If you would just follow the Code, you would be on the Council. ... While the term was used to refer to Force-users who walked the line between light and dark, Jedi were also labeled as Gray Jedi for distancing themselves from the Jedi High Council.