I think I've realized why Jackie from Jackie Chan Adventures was such an endearing protagonist. Stuff like his bond with Jade & ability to fight helped sure, but what really made his personality work is this:
Jackie is a man who treats being a good parent to the child dumped into his care, being a responsible archeologist and fist fighting demons gods to all be equally daunting tasks.
Thus he is able to straddle this strange line between being easily the most competent person in a room at ay given time & the most stressed out, put upon every-guy you've ever seen.
This is all tied up in a bow, when his perspective on these things flips. IE, sometimes when the stars align he will treat the enormous danger he's in with the same gravity as tutoring his niece.
Which allows him to straddle the exact opposite line of most unflappable guy ever and incredibly dorky but good hearted nerd who greets old college friends with a cheerful hug.
Right after said friend gassed and kidnapped him.
But yeah, it was just a really fun way to write him.