The Protagonist is the leader Denpa Man who is in love with Crystal (The Denpa Woman), each time you start a new game a Protagonist is chosen at random between 31 or more I don't know but they are different possibilities (and more in later games).
All of them have the Revive Antenna.
The Protagonists in The Denpa Men: They came by WaveEdit
The different protagonists in alphabetical order are:
Protagonists in The Denpa Men 2: Beyond the Waves Edit
You still have a chance of getting the old ones, but here are the new ones:
These are all I found for now, I will find more later.