I'll admit it's a bit weird for one-off ninja like Playboy Sasuke (who only appeared in the Naruto movie Road to Ninja) and Shikamaru reading make-out paradise (which was a skit panel IIRC, so one of the many little asides in the series, basically Kakashi introduces Shikamaru to the books because he's old enough to get it or something) to be such big things, it would be like suddenly releasing alt-artist Samurai Naruto as a character and then there is sailor Sakura and swimsuit Ino, again just lifted from one-offs and not main series canon.