Hahahaha! I knew I'd get a response, finally! 
Well I suppose I can start off with the Chaos Forms, take note that I'm also pulling certain forms from STC and Sonic X into the mix, since there is a Sonic X Zone in the Archie Sonic Universe this form could POSSIBLY happen in the comic, the STC form in question is here for completions sake. Here we go!
Chaos, as you all know, is the infinite source of energy and life in the Worlds of Sonic The Hedgehog, which spawned off several forms of life, other types of energy, and even the gods themselves. Should a mortal being tap into this source of energy they are given great power if they are naturally adapt to it. Under certain conditions it takes form in different ways, the forms I am listing applies to Mobians and possibly Humans as well, other forms of life may differ such as aliens. Each form of Chaos differs from the user depending on how their Core (soul) works, be that Negative or Positive energy, these are the forms that are known to ancient beings, gods, and life forms that exist in Zones unknown even to The No Zone.
Chaos Light Forms
The user is able to use the positive energy of Chaos through the emeralds, allowing them greater strength, near invulnerability, and enhancing the user's natural abilities. There are 3 recorded forms of Light birthed from Chaos, they are as followed.
Super Form: The default and 1st form of Light, you all know this one well enough, the user has the power of a demigod more or less, thus one or multiple users under this form could take down a demigod or a full god if said god is corrupted or filled with negative energy. The traits of this form are different for each user, bright colored eyes and hair (and/or fur) are the usual traits for this form.
Hyper Form: The 2nd and rarely seen form of Light, it is gained by using all the emeralds while they are awaken by the controller. The user is even stronger in this state and could even be mistaken for a god. Not only is the user's power even greater, but they are also able to use new abilities and may even be able to naturally control certain elements even if they are untrained to do so. Those untrained usually can only use 3 elements however. The traits of this form are brighter colors, sometime multiple colors with the eyes usually the same color as the users hair.
Ultra Form: The 3rd and mythical form of Light, it is unknown just HOW it is obtained or If it's even possible, some say that you need both the controller and the emeralds, others say that you must have a strong enough will to awaken it, scholars say both previous theories are required. It is unknown if it has ever been obtained let alone seen before. Should this form be possible, they would have the power of a Titan and able to do nearly anything, possibly even resurrect the dead. But such tales are only in scriptures...aren't they? It is unknown what appearance this form has, but I can guess that the user is even brighter then before with colors signifying good and holy traits, tales state that mutations arise during this form but no one really knows. It should also be noted that a Chaos User in the Prime Zone of our world has apparently obtained this state, but through observation we discovered that the user's "Ultra" form is nothing more then a weaker Hyper Form using 1 Super Emerald or through collecting a Billion Rings.
Chaos Dark Forms
The user is WILLINGLY using the emeralds to cause harm to others for whatever reason, be that vengeance, jealousy, or to even protect loved ones. The user is giving into his or her darker desires and through the emeralds turn into these forms, it is also said that it is obtained by using imperfect Artificial Emeralds, such cases have also been recorded.
Dark (Super) Form: 1st and Default Dark Form, the user is letting himself use his negative emotions to harness the emeralds power, thus this form is a result. Very Rare Cases state that a user who has entered this form once is able to do so again WITHOUT using the emeralds, however it is said that this trait only applies those who are adapt users of Chaos Energy, however that is pure speculation. The user symptoms are darker colors, mostly black and a dark colored aura, most noticeable is that the user's irises disappear.
Evil (Dark Hyper) Form: 2nd and Very Rare Dark Form, the user is letting himself become consumed with these desires and are using the Super Emeralds in order to do so. Only two recorded cases of this has happened, the aftermath of both incidents resulted in dozens to hundreds dead. After obtaining the users, further observation has shown that the user's personality has changed after the transformation. Such changes are aggression, indifference, and easily prone to violence. With training, withdrawal, and therapy 1 of the users is making a successful recovery, the other user however has since been placed in an asylum. Symptoms of this form are similar to the 1st, with a different colored aura, an even darker color for the users hair, and strange mutations such as irregular hair/fur length. In one of the users it is said that horns started to form on his head.
Oni (Dark Ultra) Form: 3rd and Mythical Dark Form, much like the Ultra Form it is only in myths and tales. From what we can gather the user has let himself completely be consumed by Negative Chaos Energy, resulting in a form that has only been described in stories as Demonic, with several mutations such as Reptilian Wings, Horns, among other things. Most noticeably is that the eyes have a Dark Color to them, with the irises usually missing, but under scripture it is said that the irises of an Oni is lizard like. One story states that the user after the form was never the same, what that means is up for interpretation but it's safe to say that it completely corrupts the user with no hope of recovery. All precautions are taken so that no user reaches such a form, which is why training for Chaos Users is so difficult, most say such a form is an old wives tale, but you can never be too careful...
Chaos Demon Forms
A Rare Phenomenon, but taken seriously nonetheless, the user has been unwillingly exposed to negative chaos energy, though this does not always happen a Demon Form may arise as the end result. When this happens it appears that a Light form is taking place, but that is not the case. The Demon Form is a sentient being formed by the user's repressed, darker emotions, creating a monster that has no remorse or good will. Most noticeably is that in one zone the emeralds were used as a syphon to absorb negative energy, and when it was unstable it hit a user, causing this form. Those who are cursed with this form are always fighting for their very lives and those around them, as the Demon can show up anytime Chaos Energy is around the user or during extreme stress. It cannot be destroyed by normal means unless the Demon is extracted from the users body and drained of all it's Chaos Energy, that is the only way to kill a Chaos Demon.
1st Demon (Super) Form: A Chaos Demon is born out of a user exposed to Negative Energy against their will. A common trait for a Chaos Demon is a pure hatred for his counterpart and everyone his alter ego is associated with, thus with what short time the Demon has it likes to destroy anything it can that the user holds dear. However it is very provocative and will destroy whoever is in it's way or if it's attacked. Among the normal powers of the Light and Dark Forms, the Demon is able to naturally control Chaos Energy much easier if said user is untrained, such as firing beams from it's eyes. Though the traits of the Demon are similar to the appearance of a Light Form, The Demon looks more erratic with the teeth turning into sharp fangs, most noticeably is that the irises of the eyes have this hypnotic swirl to them. Another thing to note is that the Demon sometimes has an aura around it, some cases show that a Demon is surrounded by an element, some say the Demon itself can barely control it's own energy.
2nd Demon (Hyper) Form: For some reason, a Chaos Demon has SOMEHOW managed to reach Super Emeralds! Who in their right mind allowed this to happen is beyond me. There is only one recorded incident where this happened, the end result was the complete destruction of the zone and all life in it. When this happened all gateways were shut and nothing could get in or out of the Zone, the demon eventually died when it ran out of energy to absorb, after that the user soon followed as the only thing left was cold space in the zone. A brief glimpse of the Demon was seen before the zone was cut off, it was described as having the appearance of a Hyper Form, with common mutations for a Chaos Demon. One of the viewers said that the Demon looked even more mutated but at what degree is unknown. Not much else is known about it as this has only happened once, which is why we listed the Chaos Demon's forms as 1st Demon and 2nd Demon, or Demon Super and Demon Hyper as the forms are also known as.
Final Demon (Ultra) Form: This form is only listed for completions sake, Officially it doesn't exist but considering the possibility of the Ultra and Oni form, as improbable as it is we can't just rule it out. This form must NEVER come into existence, if such a Demon were unleashed no force (sans possibly the Ultra and Oni Form) can stop it. What kind of damage it can do is unknown, but with the Demon Hyper able to take out a whole Zone in less then a month it's best not to think of such things. As such it is unknown what the Final Demon would look like and it is up for pure speculation.
Pure Chaos Forms
A Legend that up until recently was only thought as one, this form is obtained when a user has a natural connection to Chaos Energy itself with no need for any emeralds. Under certain conditions the user undergoes this form. While it was only in scripture, a user from the Prime Zone recently reached this form. Even though he died while trying to take out an enemy with all his Energy the user ACTUALLY came back from the dead after being a part of the Chaos Source. Such feats of cheating death are either extremely rare and even then was never done before with Chaos Energy. This observation shows skeptics that Chaos Energy truly has unlimited potential!
Phase 1: The user has become a living Chaos Emerald and is able to do many things due to his connection to Chaos itself. It's been said that the user gains an altered state of mine, and may even be unstable. It's theorized that this form enhances ALL emotions and thoughts of the user, but it is not entirely clear. From looking at this form the User is as powerful as The Hyper Form, maybe even a little more...but that's up for debate. The user appears to be in only one color, it could vary for each user much like other forms
Phase 2: The scriptures state that should the user reach enlightenment (Phase 1), the user will begin to become one with Chaos. While these scriptures were long thought to be myth, it doesn't hurt to see what they say about this form. Apparently the user begins to mutate and take traits from a Chaos Creature, the natural defense of the emeralds. The mutation starts with the users limbs becoming more like the creature, with a Chaos Creature's Horn (or Horns) coming out of the user. It seems that the user starts to enter a feral state after this but it is unclear what happens next as the text that follows so far has yet to be translated. The users eyes become a pure color with no irises, even the teeth start to look more like a transformed Chaos Creature's.
Final Phase: "After the user absorbs the controller, the wielder begins to forever be with chaos." It seems like this phase is the final step in evolution for this form, the user before entering this phase becomes a pure Chaos Creature, following that the only desire that the user now has is to absorb the controller, once that happens...well that's all the text we can find, the rest of the scriptures say what happens after the user succeeds or fails but nothing about what happens in the middle. Anti Climatic I know, but the search remains for those texts and that's about it. I can only imagine what happens, but perhaps it's better that way...
Phase 0: Technically Phase 3 but considering this has more to do with the aftermath of the "event" we decided to add this in at the end. After...whatever happens, the user becomes a Chaos Creature. That's about it actually, it states that it will "guard the controller for all time" something, something, you get the idea. While Chao are regular pets and Natural Chaos Creatures are rare it is surprising that the scriptures state that a user can BECOME one! Everything else is up for speculation, but should a user EVER enter Phase 1 or 2 we advice the user to NOT enter the "3rd" and Final Phase as according to the scriptures THERE IS NO GOING BACK. Some have tried to turn Chaos Creatures back into Chao but all attempts to do so have failed so far. While we were expecting amazing discoveries when we found these scriptures, none of us could have imagined what we have found!
We are discovering new things about Chaos Energy everyday, the possibilities are truly endless but also VERY dangerous, while text is still being translated we are always one step closer to uncovering all the secrets of Chaos. Recently we have found texts saying "Omni" and "Devil" but those are most likely alternate names for the forms we have scientifically proven to be the absolute evolution in Chaos for Sentient Life, as many cultures give names to different forms. We thank you for watching this presentation, and have a good day!
...WOW That went on for FAR TOO LONG, I'm gonna need a break before I talk about The Source of All, until next time.
Seriously, HOW THE HELL did nobody know that Robotnik was evil!? I mean just look at those red, glowing, hellish eyes, oh yeah I can completely trust that guy with my life! *sarcasm*