The theme song from Mighty Mouse gives the description of a hero that I subscribe to. A hero is someone who is there to save the day when someone really needs saving. Anyone can be a hero if they answer the call when fate provides them the need for one.

Mister Trouble never hangs around
When he hears this Mighty sound.
"Here I come to save the day"
That means that Mighty Mouse is on the way.

Yes sir, when there is a wrong to right
Mighty Mouse will join the fight.
On the sea or on the land,
He gets the situation well in hand

So though we are in danger, we never despair
Cause we know that where there's danger he is there!
(He is there, on the land, on the sea, in the air!)

We're not worrying at all
We're just listening for his call
“Here I come, to save the day!”
That means that Mighty Mouse
Is on the way!

We're not worrying at all
We're just listening for his call
“Here I come, to save the day!”
That means that Mighty Mouse
Is on the way!

source: https://www.lyricsondemand.com/tvthemes/mightymouselyrics.html