Soul Ring

Soul Rings (also known as Remembers), are types of Rings that, instead of protecting life as it is, can preserve life after death. All that is needed is someone's life form data to create a Soul Ring in their likeness. Soul Rings, if created correctly, can completely replicate the memories, personality, and spirit of the deceased person in question. They can even project holograms of those they exist to replicate.

Despite how perfect it may seem to friends or family of the deceased, Soul Rings aren't actually the same entity as the person they replicate. They are just robots at the end of the day. Dry husks of what they are trying to merely imitate.

Trivia

 * If Soul Rings were created by Kintobor Science Corp, it is quite possible that the corporation is also responsible for the standard gold Rings that Sonic often collects.
 * The existences of ghosts in Sonic have always been mysteries. Especially in Sonic's Hourglass, it was never fully explained how Sonja, Miles and Scroobly ever came back from the dead. Sonic describes it in one ending as a miracle. But the existence of Soul Rings implies that these are all examples of these people being replicated as Soul Rings.