The reason Gamera is the Friend to All Children? A huge shaper of the franchise, Noriaki Yuasa, grew up in the Imperial and then Post-War eras of Japan. After experiencing trusted teachers feed him Imperial propaganda in one era and then pro-Communist propaganda in another, he realized adults were often trying to manipulate children. He wanted to give the kids a character they'd always be able to trust to protect them.
The classic Gamera March, especially when one finds out the singers were all school children who eagerly volunteered to sing about one of their favorite characters.
Heisei Era
Gamera intercepting the sonic ray a Gyaos fired at a crowd of people, blocking it with his own hand.
Reiwa Era
The acoustic rendition of the classic Gamera March song serving as the end credit's music. Feeling like a heartfelt send off, knowing the lyrics makes it almost sound like a lullaby assuring the children that Gamera will always fight to protect them.
