Sai is apart of root anbu trained by Danzo. Sai has seen some shit and have done some shit he took on Naruto Shikamauru and Choji. So when I first found out Sai I was like omg he's Naruto age in anbu AND Sasuke REPLACEMENT so obviously he shits on everyone else in part 1 because he haven't even showed up until part 2. I'm kinda upset that I can never find fan art of his part 1 self or a cameo or filler of him with part 1 characters. Now can someone explain to me how Sai is a badass cause right now I don't even know if he can take on one tailed Naruto from part 1 Sai is is anbu and I just don't understand how is he so weak I hope he turns out to be Danzo son he never wanted.....