Shadow The Hedgehog Test

"In the aftermath of all the events he had endured, Shadow decides to join G.U.N. as an agent in a similar fashion as Rouge the Bat, looking to the future instead of being forever trapped in his past as he had allowed himself to be since his introduction in the series." - Sonic Retro

Shadow made his debut in Sonic Adventure 2, when he was awakened by Doctor Ivo "Eggman" Robotnik on Prison Island after being asleep for fifty years.

Many conspirators like to believe that Shadow the Hedgehog is indeed an android; due to his clones that appear in Sonic Heroes and Shadow the Hedgehog...although, all of that was soon put to rest when Dr. Eggman confessed the truth about who he truly was. (This can only be achieved if you manage to stay in the fight with Devil Doom for nine minutes)
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"Shadow, can you hear me? This might be the last chance I have to speak to you, so... what I said, about having created you? It was all a lie. Everyone thought you'd died during that horrible incident, but I rescued you with one of my robots! You'd lost your memory, that's all. You really are the Ultimate Lifeform my grandfather created!" - Eggman (Shadow the Hedgehog: The Last Way)

"First introduced in Sonic Adventure 2 as a villain, he soon took on the role of anti-hero, becoming yet another rival of Sonic." - Sonic Retro

Shadow could be suffering from a mild form of schizophrenia and a moderate depression. He also might be suffering from Post Traumatic Stress Disorder (PTSD).

He is known to have no romantic interest or relation with any character in the entire series.

"Even with the resources at his disposal, Professor Gerald was unable to make significant progress. Without alerting anyone, Gerald decided to plea to the stars for help, contacting the Black Arms race. An alien civilization that lived upon the Black Comet, a celestial object that passed near the planet every fifty years, its leader Black Doom offered to assist Gerald in his quest. He offered his blood - which ended up being the key to perfect the ultimate lifeform - in exchange for the seven Chaos Emeralds, which he would collect the next time he passed through. Knowing that the Black Arms' intentions were less than desirable, Gerald made the deal regardless, and was able to successfully create Shadow the Hedgehog." - Sonic Retro

Commander Tower approaches Shadow during one of the cutscenes, pointing a gun towards him. He claims that he had waited all his life to kill him, after having been told that Shadow was the one who killed everyone he loved on the ARK.

Chronologically 50, Physically 15.

"When being designed, his original name was Terios, which translates to "reflection of," more than likely to play off the hero/villain dynamic within the game." - Sonic Retro

They always compete against one another, along with antagonizing each other; due to them both having cocky attitudes and similar skills.

Shadow does not dislike being with others, just prefers company that does not pester him.

"Shadow has the ability to manifest Chaos energy as a physical force, and use it to attack his enemies." - Sonic Retro

In the television anime, "Sonic X"; Shadow befriended three humans. Maria, Molly, and Chris...all having different reasons for their bondship throughout the series.

The traits selected for Shadow are arrogant, aloof, intelligent, and professional. These traits suggest that Shadow may have a sense of superiority and may not easily connect with others. They also indicate that Shadow is highly intelligent and carries themselves in a serious and formal manner.