A killer from 19th century London. In fact, he is not the true Jack the Ripper, but only took his nickname.One of the representatives of humanity, Einherjar, who defeated Hercules. Bloodthirsty, but thanks to Hercules he reduced his thirst for blood.Jetelman, a genius, is calm, can show empathy and kindness. His Valkyrie partner is the 11th Valkyrie in seniority Hlökk. Jack's right red eye can see emotions.He can detect emotions by color.Refers to this ability as "Eye of the Soul".