@MarqFJA87 Idk the artist just made it look really feminine. Looks like one of those short haired cool beauty assassin or in this case (anti?)hero adult woman, an aneki type character you'd find in other manga/anime. Especially the head with the lips, eyes, earring, jawline, etc. Also, the hair is different from his image on the next page, white/silver vs black, and the sideway/diagonal bang. Overall, it's like the polar opposite of the MC.
Also, when the goddess said "please assassinate the strongest being, the hero" normally we'd expect to see a glimpse of the powerful antagonist, the hero. It would make sense for the image to be the hero, just like it would in any other manga.