Sankaku Channel/kid soldier

The term "kid" here is somewhat nebulous as per its normal(slang)use because(unlike the child soldier tag)this descriptor is really only limited to displays(even if simply based on)the more youthful(basically before and/or beginning adulthood/teenage)looking line of fighters, snipers, attackers, defenders, martial-artists, ninjas, pirates, jedi, spartans, gladiators, guardians, tekken, sentries, explorers, knights, warriors, samurai, assassins, berserkers, police, swordslingers, brawlers, wrestlers, athletes, cowpokes, gunslingers, archers, thugs, imperial-guards, mages, wizards, warlocks, mercenaries, hunters, daredevils and of course(that's about it +)soldiers|
ALSO
The stipulation "(even if simply based on)" means when dealing with a character that's part of an actual canon that hasn't reached an age of maturity in their canon currently then ALL depictions can qualify for this tag even depictions wherein the artist attempts to age said character to maturity or beyond|
4 EXAMPLE
Since aang of avatar: the last airbender never reached an age of maturity before the end of the series in which he was tha main character every depiction of him can always get this tag|
ADDENDUM
I'm leaving this up to everyone else so keeping with the above example: Since aang of avatar: the last airbender was shown beyond the age of maturity/an adult in the sequel series the legend of korra does that make fan art depictions of him as an adult by extension abiding the canon thereby rendering his "mature" fan art depictions non-applicable to this tag or was tha fact that he was a flashback and not a returning character negate this?