So far as action/shounen animes go, most of the main leads are meant to be relatively transparent/simple and connect with their viewerbase. The whole fucking anime is simplified as it is, go figure.
As for dating sims, it's that plus more. Main male characters are not only meant to be transparent, they have to be inferior to the player (theoretically). With the exception of a few games (Virgin Roster comes to mind, the pitiful h-game it is), the character is a pussy intentionally, and usually lacks any kind of depth to allow the player entry into the world.
That's why every manly character posted here is from big time "Adult" oriented anime with deeper themes and the like- older viewers don't want their hand held.