This reference and design are old. Please do not use this as a reference for her anymore. The new design is here -
https://www.furaffinity.net/view/57525492/
https://www.furaffinity.net/view/57525445/

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This is my main oc Acidic. They're my oldest, 1st, and favorite oc I'd say. Over the years they've changed, and I just redid their reference sheet for those who really want to draw her, or it's for myself. This is completely flat color with a few glow bits to emphasize.. yes, she does indeed glow. I might make a part 2 in the future showcasing her abilities, but for now, I have this general reference.

Update: Acidic now has that part 2 ref done that I was talking about. It is here - https://www.furaffinity.net/view/46852503/
Simple Reference here: https://www.furaffinity.net/view/51844989/
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Bolded - Most Important. For those who want to skim.
Visual Bio:
     Acidic is a 10 ft tall by 35 ft long drake. A drake is a wingless dragon. She's an elegant design, not bulky, and rather takes on- the best to describe it, a "wispy" look. She is the color closest to pure black. Her primary color is that black color, but a shade of dark grey comes up and mixes into her primary in a soft gradient; her scaled underbelly is a dark grey. Her belly has scales like a snake belly. The same gradient pattern applies for a darker shade of black from the top of her body. This darker black mixes with her primary and some of her green markings. And, her scales are soft for the most part.
     There are dark green, barely noticeable, patterns that run down her body length. These patterns also appear on her limbs. They are shaped like curved upside down triangles from any side view, but look like pinched-at-the-ends ovals from the front. Occasionally, these patterns are black, like on the jaw and legs, instead of green. 
      Acidic adorns a long sail, made of spikes and a soft membrane, that runs from the base of her forehead to the midsection of her tail. This sail without it's green color is black, a darker black than the primary color. This darker black is on the spikes and membrane. But, there's a light grey that is on the top of the membrane that travels down to mix with the black stated before. Lastly, her sail is flexible. The spikes there are the only spikes that have that behavior. All other spikes are hard for the most part.
     But, that's not all since Acidic has the ability to fluctuate colors in this area. So, if she's in the mood, her sail and spikes can flash a vibrant green (it has some blue in it) color. This green radiates down her sail but does not reach her body. Nor, does this green make a smooth gradient change down. Rather it transitions from green to black in a wavy side to side pattern. The green on her spikes are slightly more blue than her membrane.
     The spikes on her elbows, ankles, tail, nose, and cheeks/neck also glow when she wants. 
     The spikes on her elbows run up her arm in a vertical, but slightly pushed out, manner. She has 4 elbow spikes. There is a more tough scale pattern on her elbows.
     The same applies for her ankles, but they're closer together. She has 5 ankle spikes. Like her elbows, her ankles also have a tougher scale make up.
     For her tail, the spikes mostly resemble that of a Stegosaurus. As in, they jut outwards. They are in an electric pattern. She has 10 tail spikes. Depending on her mood, she can make these spikes fold together to be less dangerous. 
     The spikes on her neck, that start at the base of her cheek, are the same as any spike. Except, these ones run in a straight line horizontally down her neck. These spikes can fold flat against her neck.
     The only spikes capable of moving by her accord are the sail spikes, tail spikes, and cheek spikes. So, for example, her sail can lower down to show she's sad. 
     For her face, she has a nostril placement much like a Spinosaurus; it's located close to the eye.
     As for her eye, it can also change color from bright green to a dark black. Her pupil can dilate or even completely disappear if need be. If she's extremely bright, her eye emits a wispy trail of green out the back. 
     Her mouth also can change color, and it can emit a wispy like saliva if she's really intimated. It usually drips easily past her teeth and onto the ground where it soon loses its glow. This saliva after some time will fade away like smoke in the wind.
     The last thing that can change color is her claws. Of which, she has 4 claws on her front paw and 4 on the back. Her front paws have 3 main claws and a thumb. Her back paws consist of 3 main toes and a dew claw. The claws glow more green than any of her spikes. She has black paw pads too.

Abilities/Alt. Form/Extras:
    If something were to be struck by her spikes or teeth or claws while she was radiated green, it may sting much like acid. Now, this only applies if it's able to touch nerves. This "acid" isn't acid at all. It's more of a fake since it makes the minds of those affected think they're being burned. It will not burn or cause any lasting damage that real acid can cause. As a comparison, this acid acts much like spicy peppers by faking some feeling. For peppers, it is heat. For Acidic, it is acid/burning.
If Acidic is not glowing as much, the acid will not burn as much or not at all.
     Lastly, (I know this is long but she's complicated) she has a spirit form. She's actually technically immortal, but she's like a fraction of being mortal. It is quite confusing. She is 25% spirit. So, she remains in her mortal form often. But if she wanted, she can alter her form and become a wispy ghost-like figure that glows a soft green-blue all throughout. Her markings all go a bright green. This includes any black markings too. Her paw pads also follow this pattern.
     She can also go invisible in this form, and she can technically fly/float too. And, she can communicate with other spirits.. if they're around and safe to do so with. 
     Her eyes can go all black to green to even white in this form. If her eye is black, she may have an all white pupil. 
     Now, if she were to "die", she would no longer have a mortal form. She would be stuck in her spirit form without many or any memories. If it's possible to regain her mortal form or her memories, it is vastly unknown. 
     And, as a spirit, she can form into any shape, or being, or produce illusions. For example, she may change into any western dragon she wants. All her illusions, even transformations, are wispy, blue, and cloud-like.
     Other known capabilities she has in this form is rarely understood, much less known. For one, she may force any being to see through her eyes, as in.. her point of view, in the spirit world. Everything in this view would have a blue haze on the periphery of one's vision.
     The more Acidic uses her spirit form, the more it consumes her. This means each time she uses it, it'll be harder and harder to go back into her mortal form. It is unknown if this applies to her mortal form though in the opposite way. In her spirit form, her mood may be more exaggerated or unstable at times too. She may not be able to turn into her spirt form on command depending on the situation. It is a strange form. 
     Her blood is iridescent, as in.. some views it can appear slightly reddish or dark green. This is the only red she has and can be seen only in her blush. Otherwise, her blood soon goes black in color after some time of being shed.
Additional note: Her internals can also shift from bright green to the darkest of black.