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The Destined Flame and Soul of Harmony, in "Harmonic Spectrum."
My fanonical (and NOT an OC, btw) concept of an uber-powered transformation for Rainbow Dash. Originally spawned out of my head in summer 2011 (and predating Hasbro's Rainbow Power) as a need to further match Sonic the Hedgehog, as the two of them are extremely similar to each other.
Super Rainbow Dash originally appeared in two of the fanfics in my (redacted) universe, at first using the seven Chaos Emeralds from the Sonic franchise to transform. However, because the Sonic franchise's reputation had dropped in recent years with a series of badly developed games, because Equestria Daily's visitors and pre-readers REALLY don't take kindly to Sonic or anything relating to him such as the Chaos Emeralds appearing on the site at all, and due to some very interesting theories I've heard on Rainbow Dash (see them here: super-rainbow-dash-z.deviantar…), I decided to retcon those two fics and had, since 2012, been working on a fic that has her transforming through the Elements of Harmony instead, basing it on those same theories, that'll also hopefully meet EqD's high quality standards as well (this has since been abandoned, however, since EqD's pre-reading policy has become unfavorable). The fic is titled "Harmonic Spectrum."
You can read the complete rough draft version of the fic on my gallery here, or the improved version on my FiMFiction page: www.fimfiction.net/story/22568…
As seen in this art collection of her and in "HS," the appearance of her transformation is as follows:
-A pure white coat with ruby red eyes. (required) She basically becomes an albino, and was inspired by the various albino characters in various anime such as Soul Eater and Fullmetal Alchemist.
-A waving, rising, flaming rainbow mane and tail that emits embers from them (or simply a spiked-up rainbow mane, if artists so choose). (required) Inspired by Twilight Sparkle's enraged burning form and the Super Saiyans of DBZ as well as Super Sonic (especially if artists choose the spiked-up rainbow mane instead of the waving flame and embers, or a combination of both. Depends, really).
-The cloud part of her cutie mark changes from white to storm grey. (required) Since the vector of her by GeoNine, artists have begun to do the same afterwards, by changing the cloud part of it to storm grey in order to avoid blending in with her white coat. Character-wise, by making it storm grey, it symbolizes the great, sheer, Harmonic power that is wildly swirling within Super Dash.
-The Element of Loyalty necklace on. (optional) Since I originally made her transform through the Chaos Emeralds, I was at first going to go without it. But then, I got a suggestion from someone to include it and it stuck ever since. Now in "Harmonic Spectrum" and onwards, the true hidden potential of the Elements of Harmony gets unlocked by Dash, and so the Harmonic energy from the other necklaces and the Crown of Magic gets siphoned into her own necklace and into herself as well, siphoning enough to make her transform.
-Large pegasus wings. (optional) Inspired by fanart depicting normal Dash with large wings instead of her normal small ones. Combined with her being white, it certainly makes her look almost angelic, no?
The styling of the flames/mane and the size of the wings may vary in artwork of her, as well as the exact shade of white.
As shown on the poster at the top of this page, my personal unofficial theme for Super Rainbow Dash is "5OUL ON D!SPLAY" from Gran Turismo 5.
Rainbow Dash is © Hasbro/Lauren Faust.
The design of her Super form may be made up by me, but the overall character still belongs to them. It was not anywhere near difficult to design such a transformation anyway, and as such, they could easily design her like this if they wanted to.
So as far as I understand, Hasbro is well within their legal rights to use such a concept if they wish. I cannot exactly sue them over such a commonly-used concept of a Super form as well as many design aspects of her that are common as well. Unless their legal system goes deeper than I can understand, they are free to claim ownership of it as they wish.