Name: Spiked Human Bullet Tank (肉弾針戦車, Nikudan Hari Sensha; Viz "Spiky Human Juggernaut", English TV "Spiky Human Boulder")
Type: C-rank, Offensive, Short to mid-range (0-10m)
Users: Akimichi clan
Debut (Anime):Naruto Episode 113
Debut (Manga): Chapter 189
This jutsu is basically the same as the Human Bullet Tank, but Choji wraps himself in kunai tied to strings to make it more damaging. The kunai also make him move faster since Choji has more traction than in his normal ball form.
A variation of this jutsu is to use one's hair to wrap around the user's body if it is long enough, in a manner similar to Jiraiya's Needle Jizō technique, as shown during the battle against Kakuzu and Hidan.