@ChocoMacchia While i understand your point, he can easily makes the Hero look even better.
Just throw in something like "We met the Hero and she convinced us that we can coexist without us destroying you all on sight...."
To be honest i don't think the Hero's image would be affected in this situation either way.
Powerful Hero or not, anyone not fanatically braindead would realize that she has literally no chance of winning against an army of FLYING mythical beasts she can't even reach.
They could amass the armies and heroes of the entire world and it wouldn't do a damn since either:
1) they have someone that can actually fly (wizards?) = congrats, you are now in a dragon's home element, i'm sure it will end well for you
2) they don't have someone that can fly = carpet bombing from high up and bye bye everyone
This is something that really annoy me. Manga authors don't realize that even "basic" abilities like "flying" can be monstrously powerful based on the setting.
This seems to be the typical fantasy medieval setting so any being that can fire ranged attacks WHILE FLYING automatically becomes almost unbeatable simply because they have no means to REACH it.
And if that being is a an army of magical dragons.....