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Thus far very good direction you going with the story I like good kingdom building story so this I have high hopes for seeing it's before aang and katara
how will be seen later as the big bad will he and the mikealson family have a fight or will esther curse him to have some type of ripper phase
could keep him away from battle a distant fighter plus improve chakra control since you making chakra treads and medical ninjutsu is all about chakra control also the puppet can but made into a portable emergency room