I wouldn't mind seeing Janperson revived. While inspired by RoboCop, he was a pure robot, so he could still be around today.
Jiraiya was one of my favorites, although it was a poor fit under the Metal Heroes banner, since Jiraiya's ninja armor (and that of his kid sister) was mostly cloth rather than metal. That was an interesting show, because the man who played Jiraiya's mentor was the actual head of a leading ninja school, the person who popularized ninjutsu as a sport and pop-culture phenomenon and was a consultant for You Only Live Twice, playing a fictionalized version of himself (with his voice dubbed).
Some version of Juspion could be a good candidate as a Sentai replacement. Though he was very like the Space Sheriffs in other respects, he fought giant monsters and his ship could turn into a giant robot.
Jiraiya was one of my favorites, although it was a poor fit under the Metal Heroes banner, since Jiraiya's ninja armor (and that of his kid sister) was mostly cloth rather than metal. That was an interesting show, because the man who played Jiraiya's mentor was the actual head of a leading ninja school, the person who popularized ninjutsu as a sport and pop-culture phenomenon and was a consultant for You Only Live Twice, playing a fictionalized version of himself (with his voice dubbed).
Some version of Juspion could be a good candidate as a Sentai replacement. Though he was very like the Space Sheriffs in other respects, he fought giant monsters and his ship could turn into a giant robot.