>>33920824She signs her name as Platinum in the actual manga in English, even in the Japanese version.
Her name in Japanese is Purachina which is the japanese saying of Platinum.
Scanlators chose Platina because it was more female-sounding than Platinum not realizing that Purachina (Platinum) ≠ Puratina (Platina?) and that the character literally has it in Platinum in English letters, the arc is called PLATINUM, and the game is called PLATINUM.
