Chaz from PSIV: I'd give him long yellow hair and remove his headband. I'd make his armor completely black, or a dark shade of blue. Instead of the half-gloves covering his hands, I'd give him full brass gauntlets. I'd also change his age to 22.
Rika from PSIV: She definitely needs a skirt as opposed to the bikini-like thing she's wearing. I would give her a darker, more ominous appearance, but keep her kind personality.