I should sleep but I’m thinking about Bushi!Ashe and why I think it suits her. I am no expert, but Bushi were warriors dedicated the protection of a family clan. The term samurai appeared only later, and the function and social status are not exactly the same. Actually, in the Japanese version, the name of the job is mononofu, which is an even older name and function. But still it is related to a warrior and protector.
Bushi/mononofu are often compared to the european knights. So we might think Basch would be best suited to get the Bushi job. However Knight is also a job and I think his character suits the western vision more.
Bushi were wealthy and their social status is (close to?) nobility. In the game, Ashe is royalty, but she still need to get back her official function. Like a Bushi, her duty is to serve and protect. She serves her Kingdom, and it is her duty to protect the people of Dalmasca.
This is also why the presence of Vaan and Penelo is essential to Ashe and the story. They are the people of Dalmasca. She is fighting for their freedom.
Final fantasy XII &co 