The relationship is adversarial. Iron Monger poses a significant threat to Iron Man. Their encounters showcase the hero's determination and the villain's might.
I have no clear idea about such an animated cartoon. It might be something that caters to a very specific audience or has a unique style and theme that's not common. But again, without more details, it's difficult to determine exactly.
I'd recommend 'The God of High School'. It has amazing fight scenes and an engaging story. The characters' growth and the diverse martial arts styles make it really exciting.