[Spoilers]
Yes
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It is unknown at this time as at the time of this writing, Star Wars: Rebels isn't out yet. It is presumed that Captain Rex was present during the early days of the Galactic Empire.
No Captain Rex is not in Attack of the Clones. He was finally made in the Clone Wars and he was never made in the Star Wars movie saga. He might be in Episode 7 but it is just a guess.
Nose, but yes she does
He acually Used multiple kind of guns in the clone wars He use the dual pistols the long blasters and the normal blaster.
We don't know at the time, sometimes it seem so, and others it doesn't. We'll have to see where Lucas takes it! But, rex and ahsoka have a very strong relationship because rex is the first clone ahsoka met! :)
Sounds like you're referring to Captain Rex from the TV series "Star Wars: The Clone Wars"
What clone? Fives, Rex, Echo and Cody are in it and as far as i know the other clone names are unown