The character’s origin story had Drax the result of a recently killed human being’s soul getting transferred into a warrior’s body to use as a champion against Thanos.
That early version of Drax was quite different from the version that fans know today.
Given the Marvel Cinematic Universe’s predilection for direct comic book homages, don’t be too surprised if some of those more incongruous traits of the Drax character come into play on the big screen.
It’s also worth pointing out that, while he wouldn’t join the Guardians of the Galaxy for decades, Drax’s very first comic book appearance was in the pages of a 1973 issue of Iron Man.