Ohhhhhhhh myyyyy goodddddd DA here but YES YES YES THIS ALL OF THIS. I'll read innocent!naive!Finn, but I honestly do kind of lowkey despise it. He may have had a weird stunted upbringing as a killing machine, but like you said, he's a trained fighter and survivor. Also, he clearly forged relationships while a stormtrooper?? He was really affected when FN-2003 was killed on Jakku, and the actual canon (ty wookieepedia) for that relationship has Finn saving 03's ass more than once. He definitely has some stereotypical ideas about how people interact (like trying to hold Rey's hand and save her before realizing she's perfectly capable) but he's not a child?????

I HAVE SO MANY FEELINGS ABOUT THIS.