Japan oddly seems to think Saint and Hero are RPG Classes instead of titles people recognize one as.
In a culture where traditionally everyone has their 'place' in society, a title bestowed versus some kind of role or job doesn't have much of a distinction.
Also, when Japan was introduced to the idea of "saints", it was wrapped up in the early missionary efforts in Japan. When romanticized in Japanese pop culture, this term is conflated with powerful missionaries spreading influence and faith of a religion while enduring hardships on long crusades or journeys. "Hero" is an offshoot of the idea of holy warriors given mandate by these missionary movements to travel the country to protect believers and to eliminate evil.
But that doesn't mean they really get it wrong. In a lot of fiction, 'saints' might be some kind of role, but often it's a role that the character takes up because they were chosen and given powers by some god or the One God. That is basically in-line with reality. Canonization isn't a bestowment, but a belated recognition that someone was a saint the whole time. This implies that the person in question was always capable of miracles and exhibited great virtue in life and played that role.
It's still freaky how this slime treats her face like some kind of rubber mask.
Oh wait, technically it is.