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To expand into the territory of "why". Presumably your main character hit's all the buttons for three-dimensional i.e.

To expand into the territory of "why". Presumably your main character hits all the buttons for three-dimensional i.e.

EDIT: As I say in my comment the rule of thumb, rather, should be: You can have a whole host of entertaining two dimensional characters and that's cool, or a complex and brooding network of three-dimensional characters and that's cool too. But, to borrow a metaphor from the ghostbusters, one should not cross the streams. So you either ditch the character development and simplify your main character or you beef up all the other characters. Mixing both can just seem jarring.

To expand into the territory of "why". Presumably your main character hit's all the buttons for three-dimensional i.e.

the tl,dr of below is: If you don't have a great cast of supporting characters then the work you do on your main character runs a severe risk of being undermined, and hence wasted.

To expand into the territory of "why". Presumably your main character hit's all the buttons for three-dimensional i.e.