A lot of characters have been introduced showing how they were affected by the Mishima conflict, not how they affect the story. That alone sounds like they exist for their premise / archetype / foundation, however you want to call it, not for how they can pull their weight into the future. Miguel lost his sister in a bombing raid, so he fights. Steve is a test tube baby, so he fights. Leo remembers her mother, so she fights.
If I struggled to the end of my determination, to the end of my way of life with my followers, if the result is ruin, then this ruin is inevitable. Grieve. Shed tears. But you cannot regret.