This doesn't give me an image of a fortress among the clouds. Rather it gives me an image of a cheerful, scrappy rival in a fantasy-like world. Energetic, loyal, always seems to have a smile on their face. He/she would often get into fights with you not for the sake of winning, but to help you grow stronger. And when in a "party" of fighters, he/she is the everlasting moral of the group, raising spirits and bringing a smile to someone's face when they need it the most.
In my mind this song would play when you fought him/her. To remind you that this is not a fight to the death but a friendly spar between friends.
And it warms my heart.