Naruto: Crushing the Worlds, Starting with a Slug!

[Demon Slayer - Akame ga Kill! - Hokage, tentative]

Ding Ning is reborn as a slug. After a winding journey, she discovers that she's actually the slug sage of Shikkotsu Forest. She uses her awakened talent to devour and evolve.

Demon Slayer world: “Bro, you smell so good~”

Hokage world: “Little Tsunade, the spot on your chest is mine. I'm getting old, so I'm a little afraid of the cold.”

Tsunade: “But, Lord Slug, you've already taken human form. Why are you still burrowing into my arms?”