I think you're mostly right on the Hero argument. The hero in fascism idolized, whether it is the warrior defending the state, or the dictator entrusted to benefit the state, unopposed internally. Both of those fuel the militant aspect of Fascism.
I disagree with you though, Fascism is something, and that thing is a fascination with militancy of the state. It's not necessarily a 100% secular in focus, but it's more secular than theocratic, IMHO.
Fascism doesn't need other ideologies or anti-ideologies, other than a nationalist/corporatist ideology. E.g. ancient Rome being the center of the world that all other peoples could serve or be smite by.
Ideas of polarized ethics (good vs. evil) would be the strongest supporting ideology for a fascist state, but I imagine in some situations, even these might not be necessary to have a fascist state.
Ideas of superiority are pretty secondary, unless based off the polarized ethics above. These would pretty much only be used to justify militant action against other nations, but would be inherent in the the idea of heroic militancy. The hero can fight on, regardless of whether or not he/she is superior, or even good.
Ideas of destiny are good for morale, but not strictly necessary.
The corollary of your etymology of Fascism is that Fascism is the forced absence of debate. That is 'might is right' used to preempt debate (not to be confused with a debate being ended, and a decision reached by rule of law).
So I'd sum it up as:
Fascism is a militant, authoritarian state, acting on the direction of a autocratic hierarchy without public debate, and fueled by populist aggression.
A pretty complex thing.
The distinction from a democracy with it's war powers in high gear would hopefully be that democracies are such happy, rights and laws abiding things, that populist aggression doesn't exist.
EDIT: And the communists are more interested in spreading their economic social structures than obliterating all others, though conquest might be the utilitarian means for doing so.
The main elements of Fascism: And my comments on them.