Ai! Katsu! Aikatsu! Watch it right now! It’s amazing! It’ll make you glad you were born!
Raki-chan herself has one interesting catch-phrasing I could explain, which is がんばっちゃお！ (“ganbacchao!”). It’s really the ending of this which she uses frequently, which is why she appears to randomly say “ciao” at one point, and probably more in the future. Just accept it and enjoy the little bundle of hope and inspiration.
P.S. Aikatsu on Parade is a sequel to Aikatsu, Stars, and Friends. For the full experience, watching all the the previous series in their entirety is a requirement.