All three characters are voiced by Laura Bailey. 

 Platinum has three split personalities; 

The first is Luna, a rude girl with a stubborn attitude that hates Ragna, but admires Jūbei. 

The second is Sena, a polite, understanding, and sometimes curious boy who tries to calm Luna down whenever she encounters Ragna. 

And lastly, Trinity Glassfille, one of the Six Heroes, but she barely has time to control Platinum's body, which is almost similar to her own body