And what are the chances that they would raise it as a big issue if they deem the show a bad influence?
Parents would have a problem if Gentaro was a bad guy breaking rules of a good director.
It happened with some dramas.
In this case, the hero is trying to be good, being friend with everybody, fighting injustice. Parents are also more concerned about scary or blooding things that could hurt their child's mind.
Here, it's a comedy so it lights the whole thing....
for the helmets, they have the different suits for posing and those for actions. The vision possibilities is quite bad in both helmets in fact just as it's bad for the stunt actors in the monsters in general (we tend to forget the amazing work as well.) they work a lot without the suits, check the making of of Den-O for stunt actors... It's a huge work also to synchronize move and voice. Seiji Takaiwa is a god but all others are the real soul of Kamen rider and sentai... (Takaiwa san was a great Red Sentai !!)