Cadmea

-Has tattoos of "fish" that swim on his body.
-Dragon of the east, also known as the "Storm Serpent" and the "Ruler of the Moons". He brings rain and storms, and has eaten two out of the five total moons, making Usagi pretty angry at him.
-None of the four Calamities get along, despite being quote unquote siblings. They're all actually pretty aggressive with each other, and if they come across one of the others during their travels, they will fight each other.
-Flips the bird at the laws of the world. While he does have a limit to both how small and big he can possibly go, he can still physically change his total mass with no consequences to him or his environment by thousands of tons. He can even become human sized and take on a human form.
-The four Calamities are basically godlike dragons; the first ones made by Mother in fact, who wander around bringing along the seasons. Cadmea (Sen) is the dragon of spring, Jotian the dragon of summer, Anesia the dragon of autumn, and Robias the dragon of winter.
-Recklessly reckless, with no regards for those around him as he sees them all as temporary. All the Calamities share the same arrogance and disregard for other living beings, as it was just the way they were made. They lack empathy, or any real concept of how much time passes exactly. Not like they have trouble telling time, just that it doesn't weigh them down. Sen, in particular likes to treat people as his own personal soap opera and sometimes causes tragedies with his powers to observe how people react when he's bored. It's technically the least "physically destructive" habit.
-Most of the gods view them as pests since they like to stick their snouts into the god's affairs...a lot, but are unable to affect them in any way. However...when Jotian threatened to destroy the world, Mother finally broke her vow of neutrality and gave the gods a weapon able to bind them; and ever since then, the remaining Calamities have been laying low. Even if it's not in their nature to be quiet. The reminder that even they can be stopped has seem to effect Robias the most, in particular.
-Fell in love with a tree, and proceeded to accidentally destroy the forest and life of said tree; making Sen believe that his destructive nature is something he can't change.