Gozu
Gozu is a shinobi who showed up in the second Naruto Shippūden filler arc as one of Guren's subordinates. He's best known for being quiet and hard to read—most people can't tell what he's thinking—but he's genuinely skilled in a fight. His style is straightforward: taijutsu and raw strength, and he'd rather take on opponents solo.
What stands out about Gozu is how fiercely loyal he is to Guren. He's made it clear he'd follow her anywhere, which comes from a specific moment in his past. When he was locked up by Orochimaru and basically dying of thirst, Guren saved him by giving him water. That act of mercy shaped everything about how he relates to her now. She's earned his complete devotion.
Content compiled by AnimeList.moe from publicly available sources.