Yeah, it's very clear that they don't use the word 'hero' like we do in modern times. I just wasn't sure if it was just a social thing or a metaphysical one, since Leon seems to be pretty superhuman, wasn't sure if everyone has the potential to get that kind of power in this universe or if it required something special.
Well... It's explained in Chapter 1 but you don't necessarily need something special. Every living being has the capacity to learn magic, techniques, or arts and use them.
Some need more practice, and some needs less. Some are inherited, and some are not.
Energy, magic, abilities and etc are normal in HHG, most of the people who fight have them.
EDIT: Well, there IS a "requirement" to do "impressive stuff". Anyone can do SIMPLE stuff, but to go beyond that, there's a requirement. But it's not a limitation, just a requirement that anyone can achieve, it's difficult but achievable.
And if you do the impressive stuff without having that requirement, well, that hurts
