The difference in style between japanese and american animation is miniscule compared to the difference in style between american animation and american animation or japanese animation and japanese animation.

I look at Jojo's bizarre adventure and I see more in common with the X-men than I do with Flame of Recca. I look at Lodoss and see more in common with the dungeons and dragons cartoon (Which is amusing, as Lodoss is itself a converted D&D campaign) than I do with Slayers.

Attempting to shoehorn american or japanese animation or comic books into an easily defined niche is an amazing disservice to both sides, but especially to the american independent comic artists and authors out there, who really try and find a unique or realistic- or both- style.