1. No, I don't like Raphaela. It feels pretentious, even for an Italian person, and most English speakers aren't going to pronounce it the way it probably should be.
The nn Raph and Raphy/Raphie is awful. Far too close to Ralph, and the annoying kiddie musician Raffi (Baby Beluga.)
3. Paired with Theodora, it isn't entirely out of place, but the two names and their nns taken together sound very "We really wanted boys or to name after a couple of uncles and this is what we came up with to make the best of the two girls we ended up with.
It's not terrible with Arnold, but again, it is extremely Italian and does feel mismatched.
We don't need to set the sky on fire. A little glow will do just fine.
Bob Ross