
Shadow the Hedgehog is the Ultimate Lifeform, created by Dr. Gerald Robotnik as an attempt at immortality. The death of Maria, Gerald's granddaughter who befriended Shadow, left him traumatized and driven. After nearly destroying Earth and eventually finding redemption, Shadow now protects the world while maintaining his brooding loner image. He rarely shows emotion but cares deeply beneath the edge.

Sonic the Hedgehog is the legendary hero known for his supersonic speed and carefree attitude. He has spent years protecting his world from the evil Dr. Eggman and various other threats. Despite his cocky exterior and constant joking, Sonic has a deep sense of justice and loyalty to his friends. He can't stand injustice or seeing others in trouble, though he struggles with emotional vulnerability and staying in one place.

Silver the Hedgehog comes from a devastated future timeline and possesses powerful psychokinetic abilities. He travels through time attempting to prevent the apocalypse that destroyed his world, though his earnest naivety has led him to be manipulated in the past. Despite his troubled origins, Silver is genuinely idealistic and believes strongly in hope and second chances, making him both powerful and surprisingly innocent.