The trailer for F9 promises just such a person, as John Cena enters the franchise in the role of Jakob, Dom's vengeful younger brother. In an interview with EW, Diesel explained why Cena was the perfect actor for the part of Jakob.
"I felt like [director]Justin [Lim] did; the casting of that character could go a million different ways. And at the same time a very, very, very difficult character to cast. Because of that, you got to go with your gut, you got to go with your heart,