Denma(2010)

Denma

Silverquick is an intergalactic courier delivery services corporate that hires quanx with special abilities as their delivery men. Dike a.k.a the Merciless Death of Planet Urano becomes indebted to Silverquick, and becomes trapped inside a body of a small child named Denma. He takes off in a journey of making interstellar deliveries in hope of paying off his debt and reclaiming his body...

(Source: WEBTOON)