Bubbly with her own definition of "cute". [Pending]
Ryuugu is rather 'cutesy' and innocent to most by first glance, always cheerful as well as happy without a care in the world. She is not quick to anger with a considerable amount of patience, although it would not be advised to test it..
There may more to this female than what is on the sugary coated surface.
A large cleaver about the length of her arm, she carries it with her where ever she may go.
Pending..