Roy Mustang is also very memorable. His cool and calculating demeanor, combined with his ambition to become the Führer and his unique fire - based alchemy, really makes him an interesting character. He has a complex personality with his own moral code and a lot of depth to his character.
Edward Elric and Alphonse Elric are the main characters. Edward is a young alchemist with metal limbs, and Alphonse is his brother who exists in a suit of armor.
Mustang's right - hand man, Riza Hawkeye, is quite interesting. Her loyalty to Mustang, her sharpshooting skills, and her own moral code make her a great character. Father, as the main antagonist, is a very interesting figure. His grand plan for the world, his manipulation of others, and his mysterious origin all contribute to his allure. And May Chang, with her small size but big heart, her unique alchemy, and her connection to the Xingese alchemic traditions, is also one of the more interesting characters in the 'Fullmetal Alchemist Light Novel'.
Edward Elric from Fullmetal Alchemist would probably be very curious about the unique abilities in RWBY, like semblances. He might try to study them from an alchemical perspective. Ruby, on the other hand, would likely be in awe of Edward's alchemy skills and his mechanical arm and leg. She could see him as a kind of mentor in a way.
Yes, it is. The manga has a perfect balance of action, drama, and philosophy. The themes explored are profound, and the character growth is very satisfying.
Fullmetal Alchemist does continue in manga form. However, the continuation might not follow the exact same pace or style as the original series. It might introduce new plotlines and character developments.