Inappropriate in the same way that introducing a 80 year old woman, making her a geriatric, elderly assassin and calling her Lady Shiva would be. By inappropriate, I'm talking about pointlessly using a name from the comics in a way that makes absolutely no sense, even more so than the stupid version of Count verttigo.
To quote Inigo Montoya, "You keep using that word. I do not think it means what you think it means."
IOW, somebody needs to look up the definition of the word 'inappropriate'.
One of the synonyms for inappropriate is "ill-fitting," which perfectly applies in what Kirk55555 is saying about what he feels is an unsuitable casting choice. I don't agree with his opinion but I think it's clear he not suggesting that casting a teenager in the role of a character that was originally a child is in any way "morally improper" (which is another
synonym for inappropriate). The context in which he used the word makes that clear.