They are antagonist in Mel's Trip.
These humans are the two fugitives that kidnapped Takashi and his family. One of them graves a knife and told the father to be quiet or they would cut his wife's head in two. Back at the hideout, they kept the family as hostage. But the Justice broke in and attacked them. The police found both of them knocked out on the floor. Later, the news stated they they were sentenced to death and they also couldn't walk at all as their Achilles tendons were bitten off (and Alexander bit their testicles).
- The one with a scarred face is called Nishi.