Miryr Lynedè Ruud IV (born Wilde-Greyback) is a 126-year-old hellhound who is 3.14 meters (roughly 10 feet 4 inches) tall, weighs 225 kg (496 lbs), and is extremely muscular and is capable of benching 675 kg, or 1,488.22 lbs., or 3 times her own weight.
Her size can also vary, as seen with a chart below. [As per the square cube law, her mass/weight, volume, and how much she can bench (and lift with her arms and upper torso in general) will follow the multiplication process of her height with the square cube law tacked on after the fact. Below are her different sizes.
Normal: 3.14 meters (10'4")
Normal+: 31.4 meters (103 ft/9.52stories)
Macro: 80 meters (262'4.6"/24.24 stories)
Giantess: 314 meters (1,030'1.8"/95.15 stories)
Kaiju: 1 mi (1.6 km)] {Note: this is the tallest/largest she has grown. It is likely that she can grow larger if she so desires.}
Maximum comfortable size (According to Miryr herself): 66,000 ly (light-years); the same size as the galaxy IC 5332. (Made an error, whoops.)
Maximum size (Theorized by Miryr herself): 466 GLY (Giga light-year. Here about 10x the distance from the Earth to all "edges" of the Universe as we know it.)
The above makes her a & ! :3
She often can be seen wearing a somewhat battered long-sleeved shirt that contains the crest of Columbia University on it along with worn-out jeans. Her fur that can be seen is mostly jet-black, apart from her legs, the last ¼ of her tail, the inside of her ears, and one pattern on each of her cheeks: one in the shape of a full moon, and the other in the shape of a crescent. These parts of her fur are blood red. She also has blood-red hair-like fur on top of her head. She has blood-red corneas, dark green eyebrows, and irises, as well as a dark green nose. She has a split tongue, and long fangs and claws. She is also wearing an old wedding ring: a gold prong holding a blood diamond.

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