True Dragons are the highest ranking beings in existence. They're nigh-invulnerable and nigh-unstoppable avatars of nature that serve as the pillars of all creation. You are free to choose where you sit as an avatar of nature, whether that's an aspect of your own creation or one that is similar to the other True Dragons.
True Dragons, as spiritual life-forms, do not have a set singular appearance or form and can assume the appearance and properties of whatever they wish, with no real attachment to their bodies. As spiritual beings, whatever form they assume will be affected by their own personal self-image and individuality. True Dragons typically a more traditional draconic form, in addition to a secondary human-like form. Their large draconic form is capable of taking and dealing much more damage, while their human form is far more energy efficient and is better suited for long-term battles.
Once born, a True Dragon may never be truly killed. Even if their body is killed, they will be born again elsewhere with the same natural characteristics and memories. The process of rebirth may result in loss or change of some aspects of their personality, yet they will understand the nature of their new existence immediately after birth.
If left unchecked, the magicules from your aura will eventually permeate into your surroundings, mutating organic and inorganic matter to give rise to monsters or other magicule-based lifeforms, and magicule rich ores and other materials.
True Dragons have three intrinsic skills their kind shares, otherwise they are unique.
Dragon Spirit Haki: Powerful Haki that imbues the user's aura with magical and physical properties, shredding anything it comes into contact with.
Universal Sense: Allows the user to perceive almost all sensations including but not limited to, light, sound, smell, and heat in a wide radius.
Universal Shapeshift: Allows the user to freely change their body's properties and disguise their appearance.
Upon your first incarnation, you will develop a Unique Skill that synchronizes and synergizes with your aspect of nature, allowing you to fully realize your command over the natural world. With enough effort and introspection, you will be able to evolve your Unique Skill into an appropriately related Ultimate Skill that will take your command over your natural aspect even further. Your Ultimate Skill will be potent enough to potentially contain a World System Subskill, giving you the ability to create a unique world related in some way to your aspect.