Name: Stealth the Batidna
Age: Between 18 and 21 (I haven't decided on a final age yet)
Gender: Male
Parents: Knuckles the Echidna and Rouge the Bat (with some help by Chaos)
Defining Characteristics: Pure white eyes with no pupils, Guardian's crest on his chest
Backstory (in a nutshell): Stealth's creation is the result of Knuckles acting on a warning given by Chaos. This warning stated that his death was close, and that if he did not have an heir to the Guardianship, a power derived by the Emeralds themselves would wreak havoc on, and destroy, the very reality in which the world sat. Chaos himself would bless Knuckles with a confidence and power not known by him naturally, and this power would help him to court, date, and eventually marry the thief, Rouge.

The power foreseen by Chaos did indeed invade the world, but because of Stealth's existence (though he was only a small child at the time) as an heir, the threads of reality held strong, and the power was only able to destroy the world (and Knuckles with it) rather than the entire reality. Stealth would grow up in a desolate world devoid of most life save for a sole clan of echidnas that were able to hide away from the evil force, and his mother, whom the echidnas took in.

For 18 years, the echidnas and Rouge raised Stealth, training him in the ways of combat, and instilling in him a sense of pride only known to the Guardians. However, when he passed his rite of age at 18 and was given the task of guarding the shrine of the Master Emerald, he flatly refused. The Master Emerald had been shattered when the original evil power rose up from it, and all that was left of the gem had been fashioned into a blade, which had been gifted to Stealth on his 18th birthday. Stealth proclaimed that with the Master Emerald gone, as well as with the destruction of the Grey Emerald in the hands of the evil power, guarding the shrine was all but useless. The echidnas banished him for his blasphemy.

Stealth would be visited by the spirit of Chaos in a dream, and would be told of a strange destiny; to be delivered back in time by Chaos himself to before the evil power was released, and to destroy the source of the release before it could wreak havoc on the world. He was to go to the Shrine of the Master Emerald, place the tip of his blade to the pedestal, and speak with Chaos there.

Doing so, Stealth would be transported to the past, but not far enough. The evil power had drained the water god of most of his power by destroying the Grey Emerald, and though he had exhausted the rest of his power in transporting the batidna, Stealth was left in the time of the original attack of the Mriah, or the Evil Spirit of the Master Emerald. Stealth would learn that the true purpose of the power was to reunite the Spirits of the Emeralds, and to do so would mean possessing the carriers of the Spirits. The carriers were susceptible to the Will of Chaos, and in being so they were susceptible to the Will of the Mriah.

Stealth would lend his blade to fighting the possessed Sonic and Shadow, and ultimately he would defeat the two. It would take some time before Chaos had the strength to send him back to where he could prevent the Mriah's rise at all, and in this time of waiting, Stealth struck up a relationship with Amy Rose. The two would have two children together.

Eventually Chaos was able to send him back to the correct period of time, where he would find his way to the Hidden Palace and help his father to defeat the carrier of the Evil Spirit, a creature named Cherig who had been manufactured by Dr. Ivo Robotnik. By allowing his father to defeat Cherig, while at the same time preventing any of the evil creature's blood from touching the Master Emerald, Stealth was able to avert the apocalypse and save the world. Chaos would give him the choice of staying in the present time where the Mriah never struck, or go back to the time where Amy was waiting for him. He chose to go and be with Amy.
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Name: Cherig Robotnik
Age: N/A
Gender: None
Parents: Dr. Ivo Robotnik
Defining Characteristics: Soulless eyes, solid black; three tails; no mouth
Backstory: After the fiasco with Chaos, Ivo was desperate for an idea that would finally rid him of Sonic and his friends. In his research into his grandfather's work, he stumbled upon notes talking about eleven entities of Chaos, rather than just eight. Three living spirits were also created to balance the power of the emeralds, and to give help when the Master Emerald and Chaos were called upon to cease the gems' power in times of need. The research notes held no warnings about misuse of power, but Ivo had plenty of previous experience with this anyway, and knew that further research was required befoe he could attempt to harness one of the spirits. It was around this time that he discovered the notes and research concerning 'Project Shadow.'

Despite intense security encryption, Ivo was able to crack the passwords and other security around information pertaining to experiments in genetics, as well as alien technology, and something else called 'the Mriah.' Intrigued by the amount of power noted in this mysterious entity, Ivo released the result of 'Project Shadow,' which turned out to be a hedgehog by the same name. The hedgehog proceeded to follow fragmented memories to course his actions of stealing/securing the Chaos Emeralds in order to power a super weapon in the ARK Station, with intent to destroy the Earth to avenge his creator's granddaughter. He was thwarted by Sonic.

In the ensuing battle with both Sonic and another entity attached to the space station itself, Shadow regained the rest of his memories and managed to save the Earth instead of destroying it, but in doing so attempted to give his life in atonement for the grief he brought on the world.

The Neutral Chaos Spirit within his body refused to let him die, and wrapped him in a cocoon of psychic energy to prevent him from burning up in the atmosphere. The energy prevented the heat from destroying his body and the impact from crippling him, but his mind was jarred so much by grief as well as the impact of hitting the ground that it caused him to lose his memory. Ivo recovered the comatose hedgehog and helped to revive him, then left him outside of a major city with no recollection that the doctor was there at all.

The scenario of the Shadow the Hedgehog game took place, and no major plot advancements in Cherig's story took place at all, save for Ivo collecting DNA samples from Shadow, Tails, and Knuckles, as well as capturing the Evil Chaos Spirit. These samples he would use to create the shell for the evil spirit, as well as using the technology recovered from the alien invasion to imbue this shell with the spirit itself.

The creation was named Cherig, and was created with no mouth so as to prevent it from talking back to Ivo. Ivo's insanity convinced him that with no mouth, the creature would have no way to smart off and would be unable to fight back against him. This insanity would get him killed, as once Cherig was unrestrained, the creature destroyed the space lab in which Ivo was working, left the doctor to the mercy of the vacuum of space, and fell to the Earth to seek out the Master Emerald and the Guardian protecting it.

After infiltrating the the Hidden Palace and confronting Knuckles, the two fought. In the ensuing battle (before Chaos sends Stealth to intervene), Knuckles manages to defeat Cherig, but in doing so allows his mangled body to crash down upon the Master Emerald. The blood, imbued with the Evil Chaos Spirit, shatters the Master Emerald upon contact, leaving only a bit of the base on the pedestal. A golden cloud rises from the shards of the Master Emerald, introduces itself as the Mriah, and floats off, leaving a battered and shard-ridden Knuckles bleeding on the floor.