Naruto: Ninjutsu? My Pet Swallows It Whole

[Hokage + Fanfiction + Raising a Creature + Evolution + Devouring + Invincible]

Ye Chen transmigrates into the body of a war orphan in Konoha. With mediocre talent, he is bullied by classmates with bloodline limits at the Ninja Academy and is the dead-last of the dead-last. During one act of bullying, he is shoved into the Forest of Death. Desperate, he accidentally summons a palm-sized mini Godzilla with a goofy, vacant look in its eyes, using his own blood. The little creature is fragile, and its only distinguishing trait is that it’s always hungry. It can devour chakra with a single gulp.

[The first big moment]: In the Forest of Death, he encounters a ninja from an enemy village, who hurls a Great Fireball at him. Ye Chen is petrified, but mini Godzilla swallows the fireball in one bite, burps, and visibly grows larger. It even gives Ye Chen a surge of pure chakra in return. Ye Chen immediately realizes that this thing can be raised!

From then on, Ye Chen sets out on the road to raising his little one by “scavenging.” While others train, he searches the training grounds for scraps of ninjutsu. While others go on missions, he follows behind and feeds on the enemy’s chakra. Starting with devouring C-rank ninjutsu, Godzilla gradually grows larger and its hide hardens, while it begins to awaken all kinds of abilities: basic Atomic Breath (which can counter ninjutsu) and super regeneration (which replenishes Ye Chen, turning him into an indestructible cockroach).