An original character for this group. Unbeknownst to almost everyone on Earth, especially Shadow and Dr. Eggman, Terios is the Twin Brother of Shadow the Hedgehog. Despite taking great precautions to insure Shadow would ultimately destroy the Black Aliens, Professor Gerald created a Second Ultimate Life form in the form of a Black Hedgehog. Due to Shadow's DNA being the cure for the rare Neuro-Immune Deficiency Syndrome (N.I.D.S.), Gerald Created Terios with both the D.N.A. used for Shadow, plus the D.N.A. of his granddaughter, Maria, resulting in him being born with Immunity to N.I.D.S., though he was sealed away before his blood could be used as a cure, and eventually jettisoned along with his Brother Shadow. However, unlike Shadow, who knew and was very close to Maria, and was jettisoned to Earth in the past, Terios never truly got to meet Maria, and only met his Brother Shadow more than 50 years later in Shadow the Hedgehog II, as well as being jettisoned to a distant planet instead of Earth.

Due to having Maria's DNA as well, he shares Shadow's overall appearance, but has Maria's soft Blue eyes, and has blonde fur on his chest rather than white. His personality is somewhat gentle and he is very polite in his speech, greeting new people with good manners, compared to the blunt and rather distant demeanor of Shadow. Despite how young he looks, he’s actually married to a native of the planet he was jettisoned to, Numeru Drogan.

For Terios, his voice is exactly like David Humphrey’s voice for Shadow the Hedgehog, example of his voice work can be found here: https://www.youtube.com/watch?v=XwMZQhL7p1c