Kamigetsu

Kamigetsu (神折り畳み) is known for being a rouge Shinigami, with very few powers besides a deep knowledge of Shunpo and Zanjutsu, and also for having virtually undetectible spiritual energy, which coined the nickname "The Invisible Man" He acquired his powers in Soul Society, after having died on Earth. He feels that he would prefer to go rouge rather than join the Gotei 13, and does his best to avoid them, having declined membership multiple times. He's currently on the run in the human world, without a gigai.

Appearance
Kamigetsu is relatively young for a Shinigami, having died in his childhood. He has an about average amount of muscle and is the usual size for his age. His size causes most opponents to underestimate him.

Personality
Kamigetsu is fairy enthusiastic about everything, seeming ridiculous to his opponents and friends alike. Most think he's a bit silly, creating another reason for most opponents to underestimate him. His strange and funny demeanor hides a mind that never lets it's guard down, ready to activate his Shikai at any moment. One of his distinguishing traits is his absolute inability to remember even simple phrases, causing him to have virtually no Kido abilities, as even a level one spell has too many words for him to memorize.

Zanpakuto
More written later

Shunpo
He's a Shunpo master, capable of escaping most foes, but he has very little ability to control his speed, mostly using it to get away from a battle as fast as possible

Inability to be detected
Over years of evading Shinigami and Hollows he's trained his reiatsu to be completely hidden, even while using bankai, prompting many in Soul Society to nickname him The Invisible Man.