Sadai

is an assailant who entered Land of Fire to capture Naho. He was on the national wanted list.

Abilities
Sadai demonstrated great Earth Release prowess. He could easily manipulate the terrain around him to box in and turn the ground into quicksand to subdue his target. He could also encase himself in a stone armor that in addition to considerably altering his appearance, gave him great resistance from most forms of attack as well as enabling him to alter the stone as makeshift weapons. Despite the density of his armor, it did not greatly effect his mobility.

With his armor removed, he was considerably faster and more agile while demonstrated great taijutsu skill, enough to force Sasuke to use his Sharingan.

Konoha History Arc
Sadai and his group intercepted Naruto Uzumaki, Sakura Haruno and Naho. Naruto managed to defeat his comrades, but his Shadow Clone Techniques and Rasengan didn't work on him. After he captured the group, Sasuke Uchiha came and battled him. After discovering his Taijutsu skills weren't enough, he used Fire Release: Great Fireball Technique to burn assailants armor, thus showing his true face. Sasuke defeated him using Chidori, and even after assailant's defeat Sasuke punched him severely because of his words about Itachi Uchiha and Uchiha Clan Massacre and about weak Sasuke. Sasuke was only stopped by Kakashi, who reminded him that they should bring Sadai back for questioning.