I don't think people would struggle to ID silhouettes of Solid Snake, Spiderman, Captain America, Thor, Wolverine, Iron Man, Sam Fisher, Dante, Chris Redfield & Jill Valentine, Bayonetta, The Gears of War crew, Kratos, The Master Chief, Kazuya or Heihachi, Ryu & Ken, Commander Shepherd, any of the AC protagonists (as at least belonging to that series), Scorpion/Sub-zero, Batman, Darth Vader, adult Link, Lara Croft, or the Helghast.
When people speak of "generic" character designs, they generally mean you could swap out any number of people and insert them and no one would notice the difference. Most videogame protagonists are generic by design, allowing the player to fill in the blanks. I doubt there's much fan art dedicated to Nathan Hale, that guy from Far Cry 3, or Wii Fit girl.