Eternal Siphon: Fuji's Immortal Pursuit

Fuji, a soul adrift from another world, awakens in the perilous ninja lands of Naruto, cursed with an unknown origin but blessed with a unique cheat: a bare-bones status panel and an intimate knowledge of Orochimaru’s abhorrent yet effective path to eternal life. He possesses no inherent bloodline limit, a blank slate in a world defined by heritage. His ambition isn't to be invincible, but to accumulate power discreetly and achieve immortality by mastering Orochimaru's vessel-swapping jutsu. However, a profound dilemma plagues him—the moral repugnance of inhabiting others' bodies. Fuji dedicates himself to researching clone optimization and even theorizes audacious new jutsu like photosynthesis to sustain his chosen form, aiming to forge a unique, potent path to eternity within a world spanning from the Sage of Six Paths to Boruto’s era.