I'm not fond of footnotes in fiction either. The parenthetical asides that I reference are as such:
Caimus had always been a bit on the wild side. (Maybe it was Jaden's influence, but it was hard to tell for sure.)
That would not be something to include in a footnote, at all. You are the author. The entire story is your voice as the narrator. There is no tangible need to set aside your narrative observations behind parentheses.
Personally, as a reader I find them highly distracting. I'm looking for a footnote or citation at that point, or worse, the direct address mid-story A/N from writer to reader i.e.:
(And we all know what a wild-child Jaden is!)
I will concede that it is a style choice.
Good job on using the prompt words, again!