About voices

I just re-read a manga where the hero hid his identity behind a mask and a wig and his love interest realized it was him from his voice alone (and he spoke only one line or two then). (She kept it a secret so he was still clueless and thought she didn't know.) It makes me wonder why most tokusatsu heroes could get away with not being recognized while not really doing anything to disguise their voices, or, for that matter, their speech patterns (no, I don't think simply changing from 'ore' to 'watashi' really counts). (Ultras don't usually speak much, and when they do, they seem to be pretty selective as to whom they direct their voices to, so okay, they are unlikely to get caught out by their voices alone.)

( I missed Mebius's voice. )