She is physically 52 years old, but looks 21.

She has large gill slits under her rib cage, and smaller ones behind her ear fins.

Her eyes are a beautiful mix of blue-green, that can have a hazel shine in the sun or sky blue hue in the dark.

If she is out at sea for long and doesn't come home to do hair care, her blonde hair can become quite scraggly, tangled, and full of sea salt. The sea water does not affect her skin or eyes though.

Her green scaly legs start around her calf muscles, with some scales at the kneecaps which benefit her in having tougher knees. Her feet are large fins that actually contain bones; with the normal hindfoot and midfoot bones, and three (instead of five) phalanx like cartilaginous bones that she can move and stretch her fins with. Her legs are very powerful and fit for swimming like a snorkelers fins, so she has no trouble in having endurance and speed in the water. Sometimes, her legs can secrete mucous, it usually happens when she's resting.

She is quite hairy and has dark body hair on her thighs, pubic area, stomach, and arms.

Cuspid: Someone she had met when she was 18, who later became a close friend. Caspia had first met Cuspid when he was in his orca form, not knowing that he was actually human. There were complaints directed to Caspia from local communities of sea creatures, that there was a beast that was rampaging their homes and eating many of their friends and families.. At that time, when Caspia came across Cuspid he was irritable and almost hurt her, so she had to cast a Calming spell on him in order to talk to and assess the problem carefully. This ordeal results in her getting to know him and his origin, and Cuspid falling in love with her, as she showed this gentle approach to a misunderstood beast as himself. But, she also realizes that Cuspids violent nature is not something that would be easily solved. It was not until a few days later Caspia meets Cuspid in human form, and she asks for another explanation of his abilities. She wants to try helping him in avoiding hurting her ecosystem, but Cuspid is not able to guarantee control over himself.

Caspia finds herself protecting sea creatures from him quite a lot. But Cuspid grows more and more fond of Caspia, so there is hope in him changing. Caspia doesn't take much heed to his interest in her and would like to avoid it, and has to reject marriage proposals many times. When Cuspid is not over his head, she does enjoy his company and likes to talk about emotional things because she trusts him with her feelings. But a lot of times, she likes to playfully tease him especially for his romantic antics.

The times when Cuspid has to transform into his orca self, Caspia takes a lot more care to not anger him. When the week passes and he's finally human again she is usually the one that finds him washed up on the shore passed out, and she feels she has the responsibility in having to take him safely home. 

Usually though, they are not seen much together because Caspia is always busy, but Cuspid seemingly pops out of nowhere to try and greet her whenever he can.