Board Thread:Questions and Answers/@comment-32600927-20170717055129/@comment-30989661-20170717190808

First of all, you should have really thought all of this through, because its obvious from this question your story doesnt revolve around magic or the supernatural, so why include yin and yang and gravity manipulation? You need to think your story through, maybe make it so some people are just born with superpowers like in "The Incredibles" or have gods grant people powers or something, or maybe have a magical entity from another dimension die, causing his powers to spill, or something. Seeing a pattern with these solutions? They would need a story to at least somewhat revolve around all these solutions.

If you really want a lazy solution which explains their powers that does' nt cause your story to be rewritten or your characters to be scrapped then here:

Yin and yang manipulation: The character unveils a mystery in some ancient Chinese ruins which explain that the concept of Yin and Yang were based on an ancient power discovered by some Chinese people that ended up dying from their own power, after discovering the site of the Chinese Yin and Yang manipulators'  from the details of the ruins he then travels to their graves and ends up absorbing their powers

Gravity manipulation: A scientist creates a machine that bends reality and after powering it to the maximum the machine' s reality bending becomes too paradoxical, imploding and causing the whole building to explode, whoever, its paradoxical nature and its reality bending lives on and is scattered througout the area and it just so happens a person walks by close to the explosion site and the scattered paradoxical nature starts to live on in him and he discovers he can manipulate gravity

Im sorry if you find these solutions too cheesy, honestly I do too