Okay, at the risk of sounding like a grump... I really get annoyed when writers treat the fact that a character is minor as license to write them however they please, without regards to their previous personalities or backstories. The Man-Ape is a native Wakandan and doesn't use phrases like "I dunno," and the Grim Reaper, whose motives for crime revolve around brother's death and revival, isn't the stone-cold sort who'd just kill someone for no good reason.