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.